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

<passage>:
By LESTER DEL REY They weren't human. They were something more—and something less—they were, in short, humanity's hopes for survival! a big, rawboned man, barely forty but ten years of responsibility had pressed down his shoulders and put age-feigning hollows under his reddened eyes. The starlanes between Earth and her potential colonies 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 as cadets on their twelfth birthday. The two he'd drawn, Kaufman and Pinelli, seemed to be totally devoid of any sense of caution. Of course there was no obvious need for caution here. The blobs hadn't and harmless. They were ugly enough, looking like insects in spite of their internal skeletons, with anywhere from four to twelve legs each on their segmented bodies. None acted like dangerous beasts. But something had happened to the exploration party fifteen years fog. In the distance, the tops of shrubs that made a scrub forest glowed yellow-green. Motions around them suggested a herd of feeding animals. Details were impossible to see through the haze. Even the originally. "Bob!" Jane Corey's voice cut through his pondering. "Bob, there are the kids!" Before he could swing to follow her pointing finger, movement caught his eye. He saw the two cadets then, heading back to the waiting ship, just Gwayne grabbed the microphone, yelling into the radio toward the cadets. They must have seen whatever it was just as the call reached them. Young Kaufman grabbed at Pinelli, and they swung around together. Then the mists cleared. Under the dancing blobs, a horde of things was heading for the cadets. Shaggy heads, brute bodies vaguely man-like! One seemed to be almost eight feet tall, leading the others directly toward the spacesuited cadets. Some of the horde were carrying spears or sticks. There was a 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 There was no sign of the cadets at first. Then Gwayne spotted them about, two of them grabbing up the cadets. The jeep was doing twenty glimpse of five-foot bodies tumbling out of the way. Monstrously coarse faces were half hidden by thick hair. A spear crunched against the to help. They'd have to get to the group with the cadets in a hurry or against the windshield, just as he made out the form of the eight-foot leader. The thing was standing directly ahead of him, a cadet on each shoulder. Another jeep had drawn up, and men were examining the cadets. Pinelli 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 as he could, knowing their stories would only get wilder and less informative with retelling. If they could get any story from the captured creature, they might save cunningly, and only the accidental slippage had undone their work. Maybe there would never be a full answer, but he had to find four more months back. In another ten years, the sun would explode, leaving man only on the it now seemed, no more time could be wasted here. Primitives could be overcome, maybe. It would be ruthless and unfair to cemented bits of smaller wood from the scrub growth, skillfully laminated. The point was of delicately chipped flint, done as no human hand had been able to do for centuries. "Beautiful primitive work," he muttered. 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? taut with strain. The creature nodded slowly and drew something from the thick hair on on the gold ornament of a captive earthman, even to learn a little English, maybe. But Hennessy had been his friend. "How many barmaids in the Cheshire Cat? How many pups did your oldest kid's dog have? How many were brown?" The lips contorted into something vaguely like a smile, and the curiously shaped fingers that could handle no human-designed equipment spread out. Three. Seven. Zero. The answers were right. By the time the session was over, Gwayne had begun to understand the long time telling. When it was finished, Gwayne and Barker sat for long minutes in by what I know. But it happened. I've looked at a few tissues under the microscope. The changes are there. It's hard to believe about their kids. Adults in eight years, but they stay shorter. It can't be a hereditary change—the things that affect the body don't change the germ plasm. But in this case, what changed Hennessy is real, so maybe the fact that the change is passed on is as real as he claims." monsters began moving forward toward their leader. A few were almost as tall as Hennessy, but most were not more than five feet high. The kids of the exploring party.... He'd have to tell the men and women of the crew later, after he'd had time to organize things and present it all in a way they could accept, however much they might hate it at first. But there was no putting off giving the gist of it to Jane. "It was the blobs," he summarized it. "They seem to be amused by men. doesn't know why. They can change our cells, adapt us. Before men came, all life here had twelve legs. Now they're changing that, as we've seen. where three ships vanish, so we'll just disappear. And they'll never know." Nobody would know. Their children—odd children who matured in eight years—would be primitive savages in three generations. The Earth tools would be useless, impossible for the hands so radically changed. Nothing from the ship would last. Books could never be read by the new She was silent a long time, staring out of the port toward what must now be her home. Then she sighed. "You'll need practice, but the others don't know you as well as I do, Bob. I guess we can fix it so they'll believe it all. And it's too late now. But we haven't really been changed yet, have we?" "No," he admitted. Damn his voice! He'd never been good at lying. "No. She nodded. He waited for the condemnation, but there was only puzzlement in her face. "Why?" And then, before he could answer, her own intelligence gave her the seed, but no world other than Earth could ever be trusted to preserve that seed for generation after generation. Some worlds already were becoming uncertain. Here, though, the blobs had adapted men to the alien world instead of children of man's race could grow, develop and begin the long trek back to civilization. The gadgets would be lost for a time. But perhaps 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." She smiled then and moved toward him, groping for his strength. "Be fruitful," she whispered. "Be fruitful and spawn and replenish an 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 numbering. Some day, the whole universe would be a spawning ground for the children of men!

<question>:
Which word doesn't describe the cadets?

<options>:
A cautious
B naïve
C embellishers
D young

<answer>:

A