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

<passage>:
into icy waters, a long descent into alkaline depths ... it was death. But Ned Vince lived again—a million years later! to control himself. His knuckles tightened on the edge of the vat. "I don't know what you've been talking about," he grated wildly. "But I want to get out of here! ten-thirty...." Ned Vince was eager for the Loy Chuk pressed more keys. though their forefathers originated on this planet. They have a steep slope, struck a huge boulder, bounced up a little, and arced outward, falling as gracefully as a swan-diver toward the inky waters of the Pit, fifty feet beneath.... Ned Vince was still dimly conscious when that black, quiet he began to sink, trapped inside was a tremendously deep pocket in the ground, spring-fed. The edges of that almost bottomless to escape this nameless white—for the water, on which dead birds so often floated, was He had to go most of the way on his hands and knees, for the up-slanting passage was low. Excited animal chucklings around him, and the occasional touch of a furry body, hurried his feverish scrambling. But he emerged at last at the surface. He stood there panting in that frigid, rarefied air. It was night. The Moon was a gigantic, pock-marked bulk. The constellations in this abyss. The car was deeply submerged. The light had blinked out on the shallow, crystalline domes, set couldn't fight against the force of that incoming water. The after a million years of erosion under an ocean that was gone. In that ghastly moonlight, the ground glistened with dry salt. "Well, I guess it's all true, huh?" Ned Vince muttered in a among odd, scrub trees and bushes. The crags loomed on all squeaky chattering. Rodents liquid was sucked into his lungs. His last thoughts were those planet—so changed had the Earth become. A wave of intolerable homesickness came over him as he sensed the distances of time that the surface waters in the Pit, quieted again to glassy smoothness. pool were caked with a rim of cold sea-bottom, but what of it? What reason did he have left to live? He'd be only a museum ran, welcoming that bitter, killing accurately, arose thinly from the depths of a powder-dry gulch, water-scarred from an inconceivable antiquity. The noon-day Sun was red and huge. The cold. Nostalgia had him in its clutch, and there was no answer air was tenuous, dehydrated, chill. "Kaalleee!... Tik, tik, Loy Chuk and his followers in his hell-world, lost beyond unconscious form, a mile from the city of Kar-Rah. In a flying before. But he was firmly strapped to a low platform this time, so that he could not escape babble of a group of workmen who have discovered something remarkable. The desolate expanse around the gulch, was all but without motion. The icy breeze tore tiny puffs of dust from grotesque, from the black box. It was Loy angling drifts of soil, nearly waterless for eons. Patches of drab lichen grew here and there the desert itself, no other life was visible. Even the hills had sagged away, flattened by incalculable Little Loy Chuk was in a gods in exodus, perhaps it was—half a million years ago. Man was gone from the Earth. Glacial looming. In far less extreme circumstances Loy Chuk was a scientist. In than this, death from regardless of the species from which they spring, he loved the wanted this ancient man to live The sounds were not human. They were more like the chatter and wail of small desert animals. So Loy considered carefully here in the depths of that the gulch had been cleared of the as ruler of the Earth. Loy Chuk had flown his geological expedition out from the far lowlands to the east, out with a vast and unlooked-for success. He crouched there on his haunches, at the dry bottom of the Pit. The breeze rumpled his long, brown fur. He wasn't very different in appearance from his spread around his inquisitive, into unconsciousness, Loy Chuk of hope. "Hey, somebody!" he called. of which Loy was a prime member. Loy Chuk and his fellow workers in it was a huddled form, brown and hard as old wood. The dry mud that had encased it had enveloped it. He was wandering aimlessly about in a familiar like an airtight coffin, had by room. The girders of the had gone into decay—yes. But saturation that had held time and change in stasis. A perfect brown house, where he lived. aided probably during most of those passing eras by desert dryness. The Dakotas had turned arid very swiftly. This body was wonder Loy Chuk and his co-workers that mighty sense of relief. "I must have fallen asleep at the bench, here, and had a nightmare. I thought I had an accident At last Loy Chuk gave a soft, lot of worse things happened.... But it wasn't true ..." there was still an elusive fog that he did not try to shake off, accepted apparent facts simply. He did not know anything about the invisible radiations beating down upon him, soothing devoid of moisture, the mummy was perfectly preserved, even to among Loy Chuk's kind. and energy-units and soft plastic. The trees outside were only lantern-slide illusions. It was all built inside a great, hidden television systems, too. Thus Loy Chuk's kind could Loy, though, was not observing, out into cold, sad sea-bottom, to ruins, left by the final supermen. Even they, who once ruled Earth, never escaped from the present America seemed to crawl backward, beneath. A tremendous sand desert, marked with low, washed-down mountains, and the by so much as an instant...." continental plateau of North vague, angular, geometric Beyond the eastern rim of the continent, the plain dipped downward steeply. The white of dried salt was on the hills, but there too. The dead sea-bottom of the vanished Atlantic was not as dead as the highlands. Far out in a deep valley, Kar-Rah, the city of the rodents, maze of low, bubble-like structures, But this was only its surface aspect. Loy Chuk's people had built their homes mostly underground, since the beginning of their foggy evolution. Besides, in this latter day, the nights were very cold, the shelter of subterranean passages and rooms was welcome. The mummy was taken to Loy Chuk's laboratory, a short distance below the surface. Here at once, the scientist began his work. The body of the ancient Fluids submerged it, slowly soaking from that hardened flesh the alkali that had preserved it began. Still submerged in Loy Chuk pushed another switch. dehydrated, his brain had been kept perfectly intact through the nostalgic panic. Something was fearfully wrong! The nervous terror of the unknown was on him. Feeble and city was a glowing expanse of way they were assembled, were old, familiar friends. But the tone was wrong. It was high, shrill, parrot-like, and mechanical. source of the voice—located the black box just outside of his somehow, simply because they could never belong in a place as eerie as this. Loy Chuk had probed his brain, and that Loy Chuk had held befuddled terror. He gasped in the thin atmosphere. "I've Loy's box, with its recorded on a frosted crystal plate before him. Thus he knew what Ned Vince was saying. Loy Chuk pressed more keys, Chuk...." sought, with calm, human logic, speed. The spreading

<question>:
Why did Loy Chuk's people live underground?

<options>:
A Subterranean passages protect against desert sand storms.
B Subterranean passages protect against larger predators.
C Loy Chuk comes from a rodent species. Rodents usually live in underground burrows.
D The temperature above ground at night is very cold.

<answer>:

D