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

<passage>:
They weren't human. They were something more—and something less—they were, were rough on the men who traveled them now. He shuffled toward the during the night?" in the murk. I've kept a signal going to guide them back." Gwayne swore softly to himself. Earth couldn't turn out enough starmen in the schools, so promising kids were being shipped out for training seemed dangerous, and the local animals were apparently all herbivorous something had happened to the exploration party fifteen years back, and to the more recent ship under Hennessy that was sent to check trying to read sense into the things. If he had time to study them.... But there was no time. Earth had ordered him to detour here, after leaving his load of deep-sleep stored colonists on Official World 71, to check on any sign of Hennessy. He'd been here a week longer than he should have stayed already. If there was no sign in another day or so of what had happened to the men who'd deserted their ship and its equipment, he'd have to report back. He would have left before, if a recent landslip hadn't exposed enough of the buried ship for his metal locators to spot from the air by originally. the kids!" moved there. Something began to heave upwards. It was too far to see clearly, but Gwayne grabbed the microphone, yelling into the radio toward the cadets. They must have seen whatever it was just as the call reached them. momentary halt, and then the leader lifted one arm, as if motioning the others forward. "Get the jeeps out!" Gwayne yelled at Jane. He yanked the door of the little officers' lift open and jabbed the down button. It was agonizingly slow, but faster than climbing down. He ripped the door back at the exit deck. Men were dashing in, stumbling around in confusion. But someone was taking over now—one of the crew women. The jeeps were lining up. One, at the front, was stuttering into life, and Gwayne dashed for it as the exit port slid back. There was no time for suits or helmets. The air on the planet was irritating and vile smelling, but it could be breathed. He leaped to jeep rolled down the ramp, grinding its gears into second as it picked The huge leader suddenly waved and pointed toward the jeeps that were about, two of them grabbing up the cadets. The jeep was doing twenty miles an hour now, but the horde began to increase the distance, in spite of the load of the two struggling boys! The creatures dived downward into lower ground, beginning to disappear into the mists. "Follow the blobs," Gwayne yelled. He realized now he'd been a fool to leave his suit the radio would have let him keep in contact with the kids. But it was too late to go back. The blobs danced after the horde. Barker bounced the jeep downward into There was no time to stop. The jeep plowed through them. Gwayne had a The creatures vanished as Barker fought to turn to follow them. The other jeeps were coming up, by the sound of their motors, but too late to help. They'd have to get to the group with the cadets in a hurry or the horde would all vanish in the uneven ground, hidden by the fog. The wheels locked and the jeep slid protestingly forward. The creature leaped back. But Gwayne was out of the jeep before it stopped, diving Another jeep had drawn up, and men were examining the cadets. Pinelli kick at the monster. But neither had been harmed. The two were loaded onto a jeep while men helped Barker and Gwayne stow the bound monster on another before heading back. his own head, as if feeling the shock of the monster's landing. "I hope so," Gwayne told him. "I want that thing to live—and you're detailed to save it and revive it. Find out if it can make sign and why that ship was buried against detection. This thing may be the answer." Barker nodded grimly. "I'll try, though I can't risk drugs on an alien makes no sense. We've scoured this planet by infra-red, and there was no sign of native villages or culture. We should have found some." "Troglodytes, maybe," Gwayne guessed. "Anyhow, send for me when you get anything. I've got to get this ship back to Earth. We're overstaying our time here already." The reports from the cadets were satisfactory enough. They'd been picked up and carried, but no harm had been done them. Now they were busy being little heroes. Gwayne sentenced them to quarters as soon If they could get any story from the captured creature, they might save time and be better off than trying to dig through Hennessy's ship. That was almost certainly spoorless by now. The only possible answer seemed to be that the exploring expedition and Hennessy's rescue group had been overcome by the aliens. It was an answer, but it left a lot of questions. How could the primitives have gotten to the men inside Hennessy's ship? Why was its cunningly, and only the accidental slippage had undone their work. Maybe there would never be a full answer, but he had to find something—and find it fast. Earth needed every world she could make remotely habitable, or mankind was probably doomed to extinction. The race had blundered safely through its discovery of atomic weapons prevent an interplanetary war with the Venus colonists. It had found a drive that led to the stars, and hadn't even found intelligent life render the whole Solar System uninhabitable for millenia. To survive, man had to colonize. And there were no worlds perfect for him, as Earth had been. The explorers went out in desperation to find what they could the terraforming teams did what they could. And then the big starships But how could primitives do what these must have done? They were perhaps a thousand yards away, waiting patiently. For what? For the return of their leader—or for something that would give the ship to them? Gwayne grabbed the phone and called Barker. "How's the captive coming?" Barker's voice sounded odd. "Physically fine. You can see him. But—" Gwayne dropped the phone and headed for the little sick bay. He swore at Doc for not calling him at once, and then at himself for not some kind of a salute as he saw Gwayne enter, and his eyes burned up unerringly toward the device on the officer's cap. "Haarroo, Cabbaan!" the thing said. "Captain Gwayne, may I present your former friend, Captain Hennessy?" The answers were right. tall as Hennessy, but most were not more than five feet high. The kids of the exploring party.... Back in the control room, Gwayne found the emergency release levers, set the combinations and pressed the studs. There was a hiss and gurgle however much they might hate it at first. But there was no putting off puzzlement in her face. "Why?" same answer he had found for himself. "The spawning ground!" It was the only thing they could do. Earth needed a place to plant her some of the attitudes of civilized man would remain to make the next rise to culture a better one. "We're needed here," he told her, his voice pleading for the understanding he couldn't yet fully give himself. "These people need as rich a set of bloodlines as possible to give the new race strength. The fifty men and women on this ship will be needed to start them with a decent chance. We can't go to Earth, where nobody would believe or accept the idea—or even let us come back. We have to stay here." earth." "No," he told her. "Replenish the stars." But she was no longer listening, and that part of his idea could wait. Some day, though, their children would find a way to the starlanes again, looking for other worlds. With the blobs to help them, they could adapt to most worlds. The unchanged spirit would lead them

<question>:
Why were they getting the jeeps out?

<options>:
A to tour the planet
B to attack the natives
C to find the lost crew
D to go on an urgent rescue mission

<answer>:

D