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

<passage>:
Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] The Starship Pandora creaked and groaned as her landing pads settled unevenly in the mucky surface of the ugly world outside. She seemed to be restless to end her fool's errand here, two hundred light years from Captain Gwayne cursed and rolled over, reaching for his boots. He was 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 were rough on the men who traveled them now. He shuffled toward the 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 now, as they often seemed to do. Gwayne stared at them for a minute, 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 Gwayne grabbed the microphone, yelling into the radio toward the cadets. "Get the jeeps out!" Gwayne yelled at Jane. He yanked the door of 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 There was no time to stop. The jeep plowed through them. Gwayne had a 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 "I hope so," Gwayne told him. "I want that thing to live—and you're metabolism." He sucked in on the cigarette he'd dug out, then spat sickly. Smoke and this air made a foul combination. "Bob, it still 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 busy being little heroes. Gwayne sentenced them to quarters as soon 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 into a peace that had lasted two hundred years. It had managed to 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. But forty years ago, observations from beyond the Solar System had 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 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 began filling worlds with colonists, carried in deep sleep to conserve space. Almost eighty worlds. The nearest a four month journey from Earth and four more months back. In another ten years, the sun would explode, leaving man only on the footholds he was trying to dig among other solar systems. Maybe some of the strange worlds would let men spread his seed again. Maybe none would be spawning grounds for mankind in spite of the efforts. Each was precious as a haven for the race. If this world could be used, it would be nearer than most. If not, as it now seemed, no more time could be wasted here. Primitives could be overcome, maybe. It would be ruthless and unfair to 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 "Captain Gwayne, may I present your former friend, Captain Hennessy?" Gwayne had his own ideas on that. It was easy for an alien to seize By the time the session was over, Gwayne had begun to understand the silence. Finally Gwayne drew a shuddering breath and stood up. "Is it Gwayne led the former Hennessy to the exit. The waiting blobs dropped ground where no ingenuity could ever recover it to bring life to the ship again. They don't require anything from us, but they like us around. Hennessy 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. "And they don't have to be close to do it. We've all been outside the 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." 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 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 And then, before he could answer, her own intelligence gave her the 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 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 men having to adapt the whole planet to their needs. Here, the strange 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 "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 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 through all space, and the changing bodies would claim worlds beyond numbering. Some day, the whole universe would be a spawning ground for the

<question>:
What is the reasoning behind Gwayne’s decision?

<options>:
A They can take the information they learned to improve conditions on Earth.
B Earth is struggling to find suitable colonies, so they need to rescue the people here and keep looking.
C They can bring more people to this planet to live.
D Earth is struggling to find suitable colonies, and this planet has proven to be livable despite the drawbacks.

<answer>:

D