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

<passage>:
He waved his hands helplessly. "Gratitude?" he muttered. "No, you don't understand that, either." Then he cried suddenly, "But I am your friend, Robert!" arrangement: I did what Peter wished, so long as I did not actively satisfaction. His dream was perfect the was complete, every minutest detail provided for—on paper. In two weeks they would be Relief washed over him, leaving him breathless. He was horrified, of course, but only abstractedly. For the moment he could only be glad that what he had seen was terrible reality rather than even more terrible illusion. "I have no fear that the people of Earth will fail to meet this challenge, for there is no alternative. Not only our individual lives first time. " Will He mouthed the syllables, had to repeat them because he put an accent in the wrong place, and squeezed through the door as soon as it opened Lorelei, beautiful in spite of dark-circled eyes and a smear of grease "Darling, what's wrong?" "You'll understand in a minute. Turn it on, Lorelei." She gazed at him levelly for a moment, kissed him impulsively, and then Lorelei caught her breath. Lorelei buried her head on his chest, clutching at him desperately. "Peter!" she said faintly. "Why do they broadcast such things?" "They have to," he told her grimly. "There will be panics and suicides, and they know it but they have to do it. This isn't like a war, where Then they faded slowly. It was impossible to say whether they had gone through the solid wall, or simply melted away. The man and woman clung together, waiting. She was after him, clinging to his arms. "No, Peter! Don't go in there! Peter! Lorelei's assistant, was crumpled in a corner, half supported by the The Invaders ignored Peter, staring expressionlessly down at Kanin. but there was a tiny sound in Peter's brain, a thin, dry whispering. He wanted to say, "Yes, get a doctor. Lorelei—" but his mouth only He tried to get up again. "Where's Lorelei?" "She's well, and you'll see her soon. Now lie quietly. You've been a In a moment he began to relax, and the room got fuzzy again. Just before he drifted off, he said sleepily, "You can't—fool me. It's been more —than three—months." He was right. All the nurses, and even Dr. Arnold, were evasive, but he kept asking them why he couldn't see Lorelei, and finally he wormed it out of them. It had been nine and a half months, not three, and he'd been in a coma all that time. Lorelei, it seemed, had recovered much sooner. "She was only suffering from ordinary shock," Arnold explained. miracle you're alive, and rational." "But where is she?" Peter complained. "You still haven't explained why I haven't been able to see her." Arnold frowned. "All right," he said. "I guess you're strong enough to months ago." "But why?" Peter whispered. Arnold's strong jaw knotted. "We're hiding," he said. "Everything else has failed." Peter couldn't think of anything to say. Dr. Arnold's voice went on enough to take care of a quarter of the earth's population, the other three-quarters will be dead, or worse." "I wonder," Peter said shakily, "if I am strong enough to take it." Arnold laughed harshly. "You are. You've got to be. You're part of our last hope, you see." "Our last hope?" "Yes. You're a scientist." "I see," said Peter. And for the first time, he thought of the Citadel . No plan leaped full-born into his mind, but, , he thought, there's a chance .... Lorelei said, "You can't do it. I won't let you! Peter—" "Darling," he began wearily. "Don't throw your life away! Give us time—there must be another way." "There's no other way," Peter said. He gripped her arms tightly, as if but that's only delaying the end. They still come down here, only not rate is down, in spite of anything we can do. You've seen the figures: we're riding a curve that ends in extinction fifty years from now. "They'll live, and we'll die, because they're a superior race. We're a million years too far back even to understand what they are or where or twelve toes, or a dozen ears—or a better brain. Out of those millions of possible mutations, there's one that will save the human race. We can't fight them , but a superman could. That's our only chance. Lorelei—darling—don't you see that?" She choked, "But why can't you take me along?" He stared unseeingly past her wet, upturned face. "You know why," he said bitterly. "Those rays are strong. They don't only work on embryos they change adult life forms, too. I have one chance in seven of staying alive. You'd have one chance in a million of staying beautiful. Her sobs gradually died away. She straightened slowly until he no longer had to support her, but all the vitality and resilience was gone out of her body. "All right," she said in a lifeless voice. "You'll come back, Peter." He turned away suddenly, not trusting himself to kiss her goodbye. A line from an old film kept echoing through his head. " They'll back—but not as boys !" We'll come back, but not as men. We'll come back, but not as elephants. We'll come back, but not as octopi. He was trembling violently. He ran the last few steps, stumbled into the airlock, and pressed the stud that would seal the door behind him. We'll come back.... He heard the massive disk sink home, closing him off. Then he sank down on the floor of the airlock and put his head in The energy-charged screen flickered off to let him pass, and closed smoothly behind him. The last doors, cleverly camouflaged, slipped back into place and then dwindled in the distance. It was done. Already he could feel the invisible rays burning resistlessly through his flesh as if it were water, shifting the cells of his body, working its slow, monstrous alchemy upon him. Peter waited until the changes from the incubators. Time went by, meaninglessly. He ate when he was hungry, slept when his driving purpose let him, and worked unceasingly, searching for the million-to-one chance. He stared sometimes through changed eyes at the tiny blue star that was Earth, wondering if the race he had left behind still burrowed in its worm-tunnels, digging deeper and deeper away from the sunlight. But after a time he ceased even to wonder. hope.... Peter closed the diary. "The rest you know, Robert," he said. "Yes," I told him. "I was that child. I am the millionth mutation you were searching for." He turned again, and I saw the old scar on his cheek where I had once accidentally drawn one of my talons across his face. "And now," he said softly, "we will go home. I've waited so long—keeping the control chamber and the engine room locked away from you, not telling you, even, about Earth until now—because I had to be sure. But now, the waiting is over. "They're still there, I'm sure of it—the people, and the Invaders. You can kill the Invaders, Robert." they are. You can

<question>:
Why does Peter insist that Lorelei not come along for the mission?

<options>:
A He knows he will mutate when he leaves, and he can't stand the thought of her seeing him like that.
B It's too dangerous for her to go as a woman. She doesn't have the same odds of survival.
C He knows she would mutate as well, and he wouldn't be able to handle that and put the mission at risk.
D He knows that they'll be reunited, and promises to come back.

<answer>:

C