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

<passage>:
PLANET of DREAD was being marooned on a planet of endless terrors. in miniature form on other worlds. Enlarged like this. Earth, and unless all parts of the complex were present, the total was settlement. Mosquitos throve on the inhabited globes of the Rim Stars. Roaches twitched nervous antennae on the settled planets of the could see the planet that had been chosen for his marooning. It was a been left out of the seeding of this planet. The element—which might be nowhere else. There was an ice-cap in view. The rest was—clouds. The ice-cap, by its existence and circular shape, proved that the planet a bacterium or a virus or almost anything at all—the element that kept creatures at the size called "normal" was either missing or inoperable hydrochloric-acid ice. But the ice-cap was simple snow. Its size, too, thick, dense cloud-masses which covered most of the surface,—all the surface, in fact, outside the ice-cap. But since there were ice-caps , then approaching the world on planetary drive. He was to be left here, with no reason ever to expect rescue. Two of the such as are placed on certain worlds for the convenience of interstellar landing-point, and they had still to re-locate themselves. They'd been on Coryus Three and they'd gotten departure clearance from its space-port. With clearance-papers in order, they could land unquestioned at any other space-port and take off again—provided the have bought a ticket, but he'd tried to get off the planet Coryus on the Nadine . The trouble was that the had clearance papers covering five persons aboard—four men and a girl Carol. Moran made six. Wherever the yacht landed, such a disparity between its documents and because the drive had been dismantled in the engine-room. So the ship's innumerable random noises to be heard in supposedly empty space. "That's a marker," Carol announced. "I saw a costume-story tape once that had that sound in it. It marked a first-landing spot on some planet or other, so the people could find that spot again. It was supposed to be a long time ago, though." "I think," said Carol, "that we should land. People have been here. If they left a beacon, they may have left an identification of the planet. had cleared for Loris. That was where it should make its next landing. The little yacht went on. All five of its proper company watched as the planet's surface enlarged. The ice-cap appeared. There were cloud-banks everywhere, probably low down in the off-planet, and fast. But space-travel regulations are especially designed to prevent such escapes. He'd made a pretty good try, at that. One of the controls on space-traffic required a ship on landing to deposit its fuel-block in the space-port's vaults. The fuel-block was not returned until clearance for departure had been granted. But Moran had waylaid the messenger carrying the Nadine's fuel-block back to that space-yacht. He'd planet from which they'd carried away a criminal, even though they'd done it unwillingly. Investigation of such a matter might last for months. surface that the planet-wide cloud-level seemed to begin. From there on "The signal's coming from that mound, yonder." with practically no impact at all. But around her there was a monstrous burned-out hollow some three or four feet deep with a bottom of solid stone. The walls of the hollow were black and scorched. It seemed that from the mound which was the source of the space-signal. That mound no mineral surface! The landing-pockets had burned away three or four alive. And something shrieked in lunatic fashion and something else "What's that stuff there, the ground?" he demanded. "We burned it away in landing. I've seen something like it somewhere, but never taking the mound was not a fold in the ground. It was not an up-cropping of the ash-covered stone on which the dirty-yellow-dirty-red-dirty-blue-and-dirty-black ground-cover hid something. It blurred the shape it covered, very much as enormous carefully at the mound, there was a landing-fin sticking up toward the leaden skies. It was attached to a large cylindrical object of which the fore part was crushed in. The other landing-fins could be traced. "It's a ship," said Moran curtly. "It crash-landed and its crew set up a signal to call for help. None came, or they'd have turned the beacon off. Maybe they got the lifeboats to work and got away. Maybe they lived suit. Modern space-suits weren't like the ancient crudities with bulging the place of metal, and constant-volume joints were really practical nowadays. A man could move about in a late-model space-suit almost as easily as in ship-clothing. The others of the landing-party donned their special garments with the brisk absence of fumbling that these people water-soluble gases in the atmosphere, and a gas can't be an active poison if it can't dissolve. They filed out of the airlock. They stood on ash-covered stone, only slightly eroded by the processes which made life possible on this planet. They looked dubiously at the scorched, indefinite substance which had been ground before the Nadine The hole exposed a cheesy mass of soft matter which seemed riddled with Something black came squirming frantically out of one of the openings. It was eight or ten inches long. It had a head, a thorax, and an cheese-like, curd-like stuff. More black things squirming to view in that the top of the soil, here, was a thick and blanket-like sheet over the whitish stuff. The black creatures lived and thrived in tunnels under it. twenty times the size of the beetles we humans have been carrying around the galaxy, but that's what they are! discovered. It had not been practical for men to move onto new planets and subsist upon the flora and fauna they found there. On some new grow in the new-made dirt and insects to fertilize the plants so they would multiply, and animals and birds to carry the seeds planet-wide. On most planets, to be sure, there were local, aboriginal plants and large and monstrous under the conditions of a new planet. And the it, so somebody dumped germs and spores and bugs to make it ready for plants and animals eventually. But nobody's come back to finish up the job." parchment-like top skin yielded. It was like walking on a mass of was uncertain, as on a trampoline. They staggered. They moved toward the hillock which was a covered-over wrecked ship. The ground was not as level as it appeared from the Nadine's Something moved. It came out from behind a very minor spire of whitish stuff that looked like a dirty sheet stretched over a tall stone. The equally abrupt thinning, again, toward the landing-fins. The sharpness of the change was blurred over by the revolting ground-stuff growing everywhere. "We're going to find that this wreck has been here a century at least!" men—the armed ones—moved back from the smoke. They wore space-helmets But above all he raged because he was to be marooned here. He could not altogether blame the others. They couldn't land at any colonized world with him on board without his being detected as an extra member of the galaxy, naming five persons of such-and-such description and such-and-such fingerprints, voyaging in a space-yacht of such-and-such size and registration. The world they came from would claim them as fugitives. They would be returned to it. They'd be executed.

<question>:
What is hiding underneath the gigantic mound on the alien planet?

<options>:
A A pulsing, reeking object egg casing that contains countless unhatched beetle eggs
B An empty spacecraft where a crew member had survived long enough to set up a marker
C A 'yard-worm,' which is an uncontrolled type of an 'inch-worm'
D The remains of a crew that had landed on the alien planet a century earlier

<answer>:

B