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

<passage>:
Gigantic, mindless, the Monsters had come out of Westover got a shock when he stumbled onto the monster, for all that he taken it numbly as part of the fury and confusion of a world in ruin. Anyway, he was dead tired out on his feet. could see the rest—the immense slug-like shape that extended in the monster's body had formed an Westover stood motionless in the blackness nights without stopping came to his rescue. Westover plodded forward, the monster's foot, and sought above him with upstretched hands—found asleep—this is a nightmare." Once, listening to that insidious voice, he slipped and for instants hung dizzily by his hands, and for some minutes after he had found a new foothold merely clung panting with pounding heart. himself, gasping and quivering, to comparative safety on the broad shelf that marked the rim of the foot. Above him lay the great black steep that rose to the summit of the monster's humped back, a mountain not make that ascent and face the long and dangerous descent beyond, which he had to make before dawn ... but not now ... not now.... He lay in a state between waking and dreaming, high on the monster's Westover had been one of the men who, in the days when humanity was Westover no longer saw the murky moonlight, the far faint glitter of sluggishly in a cyclopean death agony. That picture dissolved, and was replaced by the face of a man—one who might now be alive or dead, elsewhere in the chaos of a desolated by tragedy the voice that went with it was flat, unemotional, pedantic. "There are so many of them, and we've destroyed so few—and to kill "The monsters who have descended on Earth must represent the end result of civilization, and the end will be far more terrible than if we were all devoured by the monsters." Westover awoke, feeling himself bathed by the cold sweat of he could not sleep but had to go on, searching with a hope that would not die for some miraculously spared refuge where civilization and science might yet exist, where there would be the means to realize his monster would begin to move, to crawl eastward impelled by the same dim around the Earth, gutting the continents and churning the sea bottoms, this—would not live long. For a man like Westover, who had been a scientist, it was not the prospect of death that was most crushing, but the death blow to his human pride, the star-storming pride of mind and will—defeated by sheer bulk and mindless hunger. at first he thought only that an attack of dizziness had made him fall, then he realized that He could stay where he was unharmed, of course. On the monster's back, of all places, he had nothing to fear from it or from others of its kind. But he knew with desperate clarity that by nightfall, when the made him unable to descend. As he lay where he had fallen, he felt that weakness creeping over him, no longer held in check by the will that had kept him doggedly plodding forward. Again he lay half conscious, in a lethargy that unchecked must grow steadily deeper until death. Isolated thoughts floated through his head. It occurred to him that he was now ideally located to conduct the experiments necessary to prove his theory of how to destroy the report to the President's Committee on Extermination.... Sutton's prediction had been a hundred percent correct. The monsters' hunger With a struggle Westover roused himself, first sitting up, then swaying hack with feverish industry at the monster's crusted hide. the monster's flesh. thing's surface round about. Westover laughed wildly with a sudden like a flea, he had lodged on a larger animal and Sutton make that the monsters, extraterrestrial though they were, were fire from the loose fibrous scale of the monster's back, and half an the wound he had inflicted on the monster. on a dog. The monster crawled by day and rested by night was conducting an experiment.... His life on the monster's back was Westover's mind was beginning to function again cessation of the rock and sway had exorcised the lethargy that had lain upon him. He knew now that he had been almost insane for the time he monster's vitals, and in a flash of insight knew them for what they were. The scientists had found, in the burst bodies of the Titans that had been killed by atomic bombs, the answer to the riddle of and that could be expelled to drive the monster in flight like a The monster on which Westover had been living as a parasite was That was the meaning of its gargantuan belly rumblings. And they meant further that he must finally leave it—now or never—or be borne aloft to die gasping in the stratosphere. Hurriedly the man scrambled to the highest eminence of the back and stood looking about and what he saw brought him to the brink of of the sea. While he slept the monster had crept beyond the coast of the days he had been on the monster's back, but the rape of Earth Westover sat for a space with head in hands, hearing the faint faint eructations deep inside the monster. the place where he had dug for food. His excavations tended to close and heal overnight now he went to work with vicious strokes enlarging "Who are you?" asked Westover, breathlessly but almost without surprise. Westover hesitated. "I'm not just imagining you?" he appealed. Westover was still not sure that the other was more than one of the powerful specters of childhood—the Preacher, the Doctor, no doubt the Teacher next—risen to rob him of his last shreds of sanity. But he nodded in childlike obedience, and followed. into utter blackness—Westover knew that both the Preacher and his own rank with the familiar heavy sweetish odor of the monster's colorless and Westover climbed to his feet and stood, weak-kneed still, staring at a chamber carved in the veritable belly of Leviathan. The floor But he brushed aside the deferential offers of the others: "No—I will take him to the Doctor myself. All of you must hurry now to close the shaft." obtrude itself in his dazed mind—by fluorescent tubes, and filled with told Westover better than words that there was something hugely he and Westover froze in dumbfounded recognition. quick eyes studied Westover's face, and he gestured toward a packing "I stumbled onto it," Westover admitted. "I was wandering across country—my plane crashed on the way back from that South American bug hunt dreamed up by somebody who'd been reading Wells' War of the had a sure-fire way to do that—but I didn't realize then that it was too late to think of killing them off." Sutton nodded thoughtfully. "It was too late—or too early, perhaps. Westover finished the brief account of his coming to dwell on the monster's back. The other grinned happily. "I haven't got so far with the theory," said Westover, "but I think from the beginning. But the monsters absorbed into themselves all the source—the monsters themselves. monster is so much like us in fundamental makeup that its body contains "Then," Westover glanced appreciatively around, "it looks like the main Westover flexed his hands involuntarily, like one who has been too from an endoparasite's point of vantage, merely by isolating from the creature's blood over a long period enough of some potent secretion—hormone, enzyme or the like—to kill when suddenly Westover stared. "Why?" "No! Of course I realize—Well, I see what you mean—I think." Westover Westover bowed his head, but he had caught a curiously expectant glint Sahara desert in the intestine of a camel—" His voice was drowned in a vast hissing roar. An irresistible pressure distorted the walls of the chamber and scythed its occupants from their

<question>:
What did Westover find inside the monster?

<options>:
A His friend
B Pockets of gas
C Demolished earth
D His death

<answer>:

A