Read the following passage and questions, then choose the right answer from options, the answer should be one of A, B, C, D.

<passage>:
Charles turned over on his side to look at her. She lay quietly in the Meanings and answers to his questions slithered out of his reach. "God," he said. It was not an exclamation, nor yet an expletive. It was a mere statement of fact. A thought teased at him. Charles looked at the woman again and decided Charles smiled wanly and got up. He stood by the bed looking at her. "Now the world is dead. The whole world is dead." New York lay quietly below him. It was the hour of indecision when freely, warmly, and Charles had accepted. But then he had known that she would. It was not him, it was the circumstances. Under the "Why did it have to be her—or me? Why should it have to happen to anybody! Why!" His thoughts beat a rapid crescendo, activating emotions, stimulating sensations of angry rage. He wanted to cry, to weep angry tears of protest. To any man, WHO HAPPENED TO BE THE LAST MAN ON EARTH! Charles picked up a heavy book end off the table and crashed it through flesh. Charles ignored it. Even smells had lost their customary stomach clenched up like an angry fist. "But I don't want to be the last man alive!" he shouted. "I don't know what to do! I don't know where to go, how to act! I just don't know—" A paroxysm of sobbing shook his body. Trembling, he dropped to his " Maybe I'm not the last! " The thought struck him with suddenness, promisingly, edged with Charles got up slowly, noticing for the first time that his fingers and dangled from the edge of the bed like a crazy pendulum. Charles to pull the sheet over her nude form, then stopped, smiling at his "That was it," he said to himself. "Pride. We called this the 'Proud cope with the situation. The president of the world-wide Society for the Prevention of Cruelty to Animals committed suicide. Within a year it was obvious to everyone that man was the only animal left on earth. The panic which had begun with the death of the animals was quieted "I've got to find out," Charles told himself. He meant it, of course, human on earth. Compulsory registration and the classification of each individual by means of the discrete patterns of his brain waves had accomplished for who was dead, and where everybody was. Once a year the Bureau issued The Index, an exact accounting of Earth's four billion inhabitants. Four billion names and addresses, compressed In all of his life, Charles had never once glanced at The Index. Reaching the gigantic building, Charles pushed aside the body of a But he still remembered it and he still recalled the powerful emotional recording that Charles had come to the Bureau some twenty-two years mechanical wonder had remained with him the rest of his life. "So different now," he thought, surveying the room. "Now it's empty, so Charles walked to the master control panel. With newly acquired Charles activated the switches that would flash a schematic map of New not because she liked him, but because.... Charles stopped talking and forced his eyes upwards. Peripheral vision He gasped. one . Charles was by himself, the last person alive in all of New York City. He began to tremble violently. The silence of the room began to press quickly in on him. His frantic fingers searched for the computer He stopped. For even as he spoke, the light winked out! The counter One. Alone. Charles screamed. The bottom dropped out from under him! Why? Such a simple question, but in those three letters lay the essence of companionship, elimination. Certainly more decisive in the history of the race. Man began to think, to differentiate himself from the other animals, when he first asked the question: "Why?" But thinking about "why" didn't answer the question itself, Charles Civilization equals life equals noise. Silence equals.... Why. His mind kept returning to the question. Of all the people on earth, me. The last. Why me? Average, that's what he was. Height: 5'11". Weight: 165. Age: 32. Status: Married, once upon a time. The Norm, with no significant departures, all down the line. Church it? Had God, in His infinite wisdom and mercy, spared his life, saved him, singled him out because he was most nearly a saint, most nearly Charles sighed. Chance. That was it! The laws of probability, the bell-shaped curve, normal distribution, rectilinear regression. More people per square foot in New York than elsewhere. The first person who died was from New York, so the last person who gave way to the disease should come from here too. Spin the wheel assumptions about good and evil, no need for teleological arguments concerning cause and effect. Simply explain it by chance. Somebody had to be the last to go and that was— "No," Charles said, standing up in the quiet of the spring evening. "No, chance won't do it. No man can reckon with chance. The mind Charles stopped walking suddenly. No cave, he thought. No place to And suddenly it was the most important thing in life to him to find his was. He let the coffin down slowly into the depression, then piled up Make it simple, he thought. And he finally wrote: HERE LIES THE BODY OF THE LAST MAN ON EARTH Yes. That was it. Simple. Let whoever came afterwards figure out the rest. Let them decide. He smiled and finished the painting. Charles was hungry. He got up and started for one of the restaurants difference, it seemed to Charles that he'd probably have a long time smallpox. The vaccination never took. That's probably it." He smiled. Strange, but now he wanted very much to go on living, alone or not. There were things he could do, ways to keep occupied. with each passing second to retain his foothold on the tenuous path of physical existence. The tantalizing thought of "why" puzzled its way back into his mind. But it seemed less pressing now that he had almost come to the conclusion that he would live for a long time. Later, in a few days perhaps, he would think about it. In a little while he'd have plenty of now he thought he almost had the answer, if there were an answer. He thought he had seen the solution peering out at him from the recesses of his mind, and he didn't like the expression on its face. Better to Charles reached the broad boulevard. There was a large cafe just across almost fell as he stepped from the curb. "I—" He started to say something, to think something. But some hidden part of his mind clamped down, obscuring the thought, rejecting the to the restaurant. This was the way the plague began, but—His mind quickly repressed the idea. It couldn't be the plague. He was immune! useless. His body, out of his voluntary control, tried to run off in Charles struggled to end his body's disorganized responses, to everything else seemed irrelevant: he had He was allotted ten minutes before the end. It could have been ten years or ten seconds, for now objective time Charles refused to think. Machines, especially half-broken machines, do pushed himself towards his goal, trying to add one final touch of grace movement that would throw him headlong into the shallow grave. He Instantly the thought struck him with paralyzing devastation. The answer to it all poked its face out from the recesses of his mind and sapped the last bit of his energy, corroding his nerves and dying The world will end, not with a bang, nor with a whimper, but with the last man's anguished cry at the unreasonableness of it all. Charles screamed. The large, invisible, ovular being that hung suspended over the Empire "It is finished?" asked the second. "Beautiful," said the first. "It went according to the strictest "I know." "Well?" the book disappeared. The thousands of pages dropped softly, caught the metal, until then partially obscured by the papers, became legible: HERE LIES THE BODY OF THE LAST MAN ON EARTH— CHARLES J. ZZYZST GO TO HELL!

<question>:
What did Charles probably realize at the end?

<options>:
A He could have stopped the plague
B There were more people alive that he hadn't found
C There was an alien on the Empire State Building
D He was the last person because of his last name

<answer>:

D