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

<passage>:
"But why?" he cried, sinking down into the chair before me. In an instant all the joy had gone out of him. I could not understand his suffering, but I could recognize it. Peter's eyes were dull, his limbs slumped. For a moment I thought that the shock had deranged his mind. His voice trembled when he said, "But if I ask you to kill them, and trickling down into his sodden sleeve, and falling, drop by slow drop, the dark blood was still oozing from the crushed ruin of his face, He waved his hands helplessly. "Gratitude?" he muttered. Then he cried suddenly, "But I am your friend, Robert!" arrangement: I did what Peter wished, so long as I did not actively then we must not go back. It was very simple, but I knew that he could and alien. It was I who had changed: something inside me was dead, like I tried to explain it to him, however. But he only stared at me, with an expression on his face that I had never seen there before, and that, Peter called an emotion to the end that I knew was inevitable. It was not a longing. I had no desire that things should be otherwise than they were. I did not even wish that Peter were not dead, for me, nagging, gnawing. And suddenly—something moved on the skin of my Young Peter Karson put the last black-print down and sighed with satisfaction. His dream was perfect the Citadel was complete, every minutest detail provided for—on paper. In two weeks they would be A discordant note suddenly entered his fantasy. He looked up, conscious that thin, dark whisper of dread was at the back of his mind. Slowly, impassively in at him. That was the first impression he got face, staring. Then he saw, with a queer, icy chill, that the face was blood-red and subtly inhuman. It tapered off into a formless, shriveled body. For a moment or an eternity it hung there, unsupported, the bulging "Lord!" he said. One part of his brain had been shocked into its shell. It was hiding It considered the possibility that he had gone temporarily insane, and were shaking. He stared at them dully, and then he reached over to the Relief washed over him, leaving him breathless. He was horrified, glad that what he had seen was terrible reality rather than even more terrible illusion. and this is more intolerable than any normal invasion. "I have no fear that the people of Earth will fail to meet this challenge, for there is no alternative. Not only our individual lives Peter sank back in his chair, the full shock of it striking him for the " Will laboratory. Peter took it in fifteen seconds, running, and stumbled to "What makes, Peter my love?" she asked, and bent back to the ledger. "Darling, what's wrong?" and below them, a pitiful huddle of flesh no longer recognizable as human beings. They were not dead, those men and women, but they wanted to be. Their bodies had been impossibly joined, fused together into a single obscene, floundering mass of helpless protoplasm. The thin moaning that went up from them was more horrible than any cry of agony. "The Invaders are here, citizens," the commentator was saying in a "Peter!" she said faintly. "Why do they broadcast such things?" out to switch off the scanner, and froze. The girl felt his muscles The man and woman clung together, waiting. Peter's lips were cold with sweat. Tiny nerves in his face and arms "Wait here," he mouthed. She was after him, clinging to his arms. "No, Peter! Don't go in there! Peter! cleared away to make room for an incompleted setup. Peter walked down distorted, hairless skulls in profile, staring at something outside his Peter forced himself forward another step. Little Harry Kanin, glazed eyes, impassive yet somehow pleading, stared at nothingness The Invaders ignored Peter, staring expressionlessly down at Kanin. In a moment Peter realized what they were doing to him. He stood, paralyzed with horror, and watched it happen. The little man's body was sagging, ever so slowly, as if he were relaxing tiredly. His torso was telescoping, bit by bit his spread There was a scream in his throat that would not come out. He was beyond fear, beyond agony. He turned to the still-hovering monsters and said in a terrible voice, "Why? Why?" The nearest being turned slowly to regard him. Its lips did not move, but there was a tiny sound in Peter's brain, a thin, dry whispering. The scream was welling up. He fought it down and listened. were lines in the face, but they were lines of age, not emotion. Only "I can't understand," he cried wildly. "What do you want?" His voice was hoarse. "Don't look! Don't—Go back!" The horrible, mindless noise in his throat was almost beyond his power to repress. His insides writhed to thrust it out. She didn't see him. Her eyes glazed, and she dropped limply to the The scream came out then. Before he knew, even, that he could hold it back no longer, his mouth was wide open, his muscles tensed, his He wanted to say, "Yes, get a doctor. Lorelei—" but his mouth only twitched feebly. He couldn't seem to get it to work properly. "Where am I?" he said. He tried to turn his head, but a firm hand Peter sank back in the bed. The room was coming into focus. He looked around him slowly. He felt very weak, but perfectly lucid. Peter's head began spinning just a little. Glass clinked from a metal milky fluid. It tasted awful, but she made him drink it all. In a moment he began to relax, and the room got fuzzy again. Just before he drifted off, he said sleepily, "You can't—fool me. It's been "She was only suffering from ordinary shock," Arnold explained. "But where is she?" Peter complained. "You still haven't explained why "But why?" Peter whispered. Arnold's strong jaw knotted. "We're hiding," he said. "Everything else Peter couldn't think of anything to say. Dr. Arnold's voice went on "And since then?" Peter asked huskily. enough to take care of a quarter of the earth's population, the other "I wonder," Peter said shakily, "if I am strong enough to take it." "Our last hope?" "I see," said Peter. And for the first time, he thought of the Lorelei said, "You can't do it. I won't let you! Peter—" "There's no other way," Peter said. He gripped her arms tightly, as if he could compel her to understand by the sheer pressure of his fingers. She choked, "But why can't you take me along?" He stared unseeingly past her wet, upturned face. "You know why," he come back, Peter." He turned away suddenly, not trusting himself to kiss her goodbye. A line from an old film kept echoing through his head. " He was trembling violently. He ran the last few steps, stumbled into he slumped down before them and listlessly closed the contact of the visiplate. heavy doors that closed the tunnel above him flashed back, one by one. The energy-charged screen flickered off to let him pass, and closed the silence pressed in about him. its slow, monstrous alchemy upon him. Peter waited until the changes Earth, wondering if the race he had left behind still burrowed in its after a time he ceased even to wonder. Peter closed the diary. "The rest you know, Robert," he said. He turned again, and I saw the old scar on his cheek where I had once He looked at me, a little oddly, almost as if he had some instinctive I said, "That is the reason why we will not go back to Earth." He stared at me, his jaw slack, his hands trembling. "What—what did

<question>:
What emotions could likely be behind the expression on Peter's face at the end of the passage when he was told that they could not return to Earth?

<options>:
A Fear
B Satisfaction
C Defeat
D Contentment

<answer>:

C