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

<passage>:
Captain Gwayne cursed and rolled over, reaching for his boots. He was 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 Of course there was no obvious need for caution here. The blobs hadn't something had happened to the exploration party fifteen years back, and to the more recent ship under Hennessy that was sent to check up. deep gorge where they'd found Hennessy's carefully buried ship was completely hidden by the fog. now, as they often seemed to do. Gwayne stared at them for a minute, 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 He would have left before, if a recent landslip hadn't exposed enough Gwayne grabbed the microphone, yelling into the radio toward the cadets. others forward. "Get the jeeps out!" Gwayne yelled at Jane. He yanked the door of 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 Gwayne dashed for it as the exit port slid back. There was no sign of the cadets at first. Then Gwayne spotted them "Follow the blobs," Gwayne yelled. He realized now he'd been a fool to leave his suit kids. But it was too late to go back. There was no time to stop. The jeep plowed through them. Gwayne had a 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 Abruptly, Barker's foot ground at the brake. Gwayne jolted forward leaped back. But Gwayne was out of the jeep before it stopped, diving shoulders, but amazingly strong. Gwayne felt them wrench at him as his sound, and it collapsed. Gwayne eased back slowly, but it made no onto a jeep while men helped Barker and Gwayne stow the bound monster "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 language or draw pictures. I want to know what happened to Hennessy 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 "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 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 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 fuel dumped? Only men would have known how to do that. And who told these creatures that a space ship's metal finders could be fooled by a cunningly, and only the accidental slippage had undone their work. Maybe there would never be a full answer, but he had to find 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 there to be dangerous on the few worlds that had cultures of their own. finally proved that the sun was going to go nova. It wouldn't be much of an explosion, as such things go—but it would 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 began filling worlds with colonists, carried in deep sleep to conserve it now seemed, no more time could be wasted here. Gwayne grabbed the phone and called Barker. "How's the captive coming?" Gwayne dropped the phone and headed for the little sick bay. He swore sound that lifted the hair along the nape of Gwayne's neck. Barker 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?" Barker said. There was a grin on the doctor's lips, but his face was taut with strain. well. Says they've had to change the language around to make the sounds fit, and he's forgotten how to use what normal English he can. But it gets easier as you listen. It's Hennessy, all right. I'm certain." Gwayne had his own ideas on that. It was easy for an alien to seize on the gold ornament of a captive earthman, even to learn a little English, maybe. But Hennessy had been his friend. By the time the session was over, Gwayne had begun to understand the When it was finished, Gwayne and Barker sat for long minutes in silence. Finally Gwayne drew a shuddering breath and stood up. "Is it 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." Gwayne led the former Hennessy to the exit. The waiting blobs dropped down to touch the monstrous man, then leaped up again. The crowd of Back in the control room, Gwayne found the emergency release levers, ground where no ingenuity could ever recover it to bring life to the ship again. 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. They don't require anything from us, but they like us around. Hennessy hull. It doesn't show yet—but we're changed. In another month, Earth food would kill us. We've got to stay here. We'll bury the ships deeper this time, and Earth won't find us. They can't risk trying a colony where three ships vanish, so we'll just disappear. And they'll never know." It was the only thing they could do. Earth needed a place to plant her rise to culture a better one. "We're needed here," he told her, his voice pleading for the 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." But she was no longer listening, and that part of his idea could wait. again, looking for other worlds. With the blobs to help them, they

<question>:
Why did Gwayne decide that they all had to stay?

<options>:
A to discover all of the secrets on the planet
B because it was the best chance at human survival
C because everyone outside the hull is beyond saving
D to try to save Hennessy and his crew

<answer>:

B