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

<passage>:
As the years went by, Martin began to lose even his detached interest in the land and its doings. Although the yacht frequently touched port for fuel or supplies—it was more economical to purchase them in that era than to have them shipped from the future—he seldom went ashore, and then only at the urging of a newly assigned cousin anxious to see the sights. Most of the time Martin spent in watching the sea—and off without them. Martin was no exception. He'd never had it this and felt an uncomfortable pang of a sensation he could no longer understand. "Where do you suppose Conrad has been all this time?" Martin idly asked the current cousin—who was passing as his nephew by now. The young man jumped, then glanced around him uncomfortably. "Conrad's a very shrewd fellow," he whispered. "He's biding his time—waiting until we're off guard. And then—pow!—he'll attack!" "Oh, I see," Martin said. He had often fancied that Conrad would prove to be the most stimulating member of the whole generation. But it seemed unlikely that he would Conrad?" "Because he's coming to kill you." "Why should he kill me? I ain't done him nothing." Ninian sighed. "He's dissatisfied with the current social order and "Oh, just don't ask any questions," Ninian said petulantly. "When you get older, someone will explain the whole thing to you." So Martin held his peace, because, on the whole, he liked things the would make up the work. Martin nearly did get sick from laughing so hired a private tutor for him. A tutor—in that neighborhood! Martin Martin was never left alone for a minute. He wasn't allowed to play Martin missed the old neighborhood, though. He missed having other When Martin was sixteen, Raymond took him aside for the talk Ninian had promised five years before. "The whole thing's all my brother Conrad's fault. You see, he's an idealist," Raymond explained, pronouncing the last word with distaste. Martin nodded gravely. He was a quiet boy now, his brief past a dim and and his speech rather overbred, his mentors from the future having carefully eradicated all current vulgarities. "And Conrad really got upset over the way Earth has been exploiting the not so intelligent life-forms on the other planets," Raymond continued. "Which passing laws to do away with the—well, abuses and things like that, and I'm sure someday everything will come out all right. However, Conrad is so impatient." "I thought, in your world, machines did all the work," Martin suggested. "I've told you—our world is precisely the same as this one!" Raymond you," Martin explained laboriously. It was so difficult to live in the frightening—his race had lost something vital. Unaware of the near-contempt in which his young ancestor held him, Raymond went on blandly: "Anyhow, Conrad took it upon himself to feel particularly guilty, because, he decided, if it hadn't been for the fact that our great-grandfather discovered the super-drive, we get to the other planets and oppress the local aborigines. "Sounds like a good way of dealing with the problem," Martin observed. Raymond looked annoyed. "It's the man, you know." Raymond's expressive upper lip curled. "So Conrad decided to go further back still and get rid of was our moral duty to go back in time ourselves and protect you." He beamed at Martin. The boy smiled slowly. "Of course. You had to. If Conrad succeeded in eliminating me, then none of you would exist, would you?" , Martin knew, could have meant anything from blackmail to the use of the iron maiden. "Then we were all ready to forestall Conrad. If one of us guarded you night and day, he would never be able to carry out his plot. So we made "So Ninian's going," said Martin, wondering why the news made him feel sentimentalist like Conrad. Though you do have rather a look of him, you know." Suddenly that seemed to make Conrad real. Martin felt a vague stirring of alarm. He kept his voice composed, however. "How do you plan to protect me when he comes?" Raymond and Martin moved into a luxurious mansion in a remote area. The Martin accepted his new surroundings. His sense of wonder had become "How about a moat?" Martin suggested when they first came. "It seems to go with a castle." "Do you think a moat could stop Conrad?" Raymond asked, amused. "No," Martin smiled, feeling rather silly, "but it would make the place seem safer somehow." The threat of Conrad was beginning to make him grow more and more nervous. He got Raymond's permission to take two suits of armor that several times he fancied he saw them move. He also became an adept with the ray gun and changed the surrounding landscape quite a bit with it, until Raymond warned that this might lead Conrad to them. During those early years, Martin's tutors were exchanged for the higher-degreed ones that were now needful. The question inevitably their vigorous family councils. Martin was still young enough to enjoy "I am not going to sit down and explain the whole thing to you all over again, Bart!" Raymond said impatiently. "Well, Martin?" "What would you suggest?" Martin asked. as an individual. When his efforts to make contact with the other young man failed, he got worried and decided that what Martin needed was a change of air and scenery. "'Course you can't go on the Grand Tour. Your son hasn't invented Tourists always like ruins best, anyway." So he drew on the family's vast future resources and bought a yacht, which Martin christened The other cousins appeared to find the yacht a congenial head-quarters, largely because they could spend so much time far away from the contemporary inhabitants of the planet and relax and be themselves. So they never moved back to land. Martin spent the rest of his life on The Interregnum . He felt curiously safer from Conrad there, although there was no valid reason why an ocean should stop a traveler through time. they came for the ocean voyage. They spent most of their time aboard Martin didn't care much for their company and associated with them only He rather liked Ives, though. Sometimes the two of them would be alone together then Ives would tell Martin of the future world he had come "Rather feudal, isn't it?" Martin asked. himself. "Maybe it is worse, the way Conrad thinks. More planets for us to make trouble on. Three that were habitable aren't any more. "Oh," Martin murmured, trying to sound shocked, horrified—interested, even. "Sometimes I'm not altogether sure Conrad was wrong," Ives said, after a pause. "Tried to keep us from getting to the stars, hurting the "I suppose not," Martin said. "Would take moral courage. I don't have it. None of us does, except Conrad, and even he—" Ives looked out over the sea. "Must be a better way out than Conrad's," he said without conviction. "And everything will work out all right in the end. Bound to. No sense to—to anything, he couldn't even seem to care. During all this time, Conrad still did not put in an appearance. Martin had gotten to be such a crack shot with the ray pistol that he almost wished his descendant would show up, so there would be some excitement. the basic flaw in the elaborate plan they had concocted, it would have been Ives. However, when the yacht touched at Tierra del Fuego one bitter winter, Ives took a severe chill. They sent for a doctor from the future—one of the descendants who had been eccentric enough to a while, Martin couldn't tell one from another. Cousin after cousin came to watch over him and eventually they were as hard for him to tell apart as the different oceans. their elders.

<question>:
Why does Martin prefer to live on the yacht?

<options>:
A Martin is used to being isolated now. The people on land live in a different world than he does.
B The people on land were always at war. Martin wants no part of it.
C The people on land are too different from the cousins. Living on the yacht avoids questions from locals.
D Martin thinks being on the ocean will make it harder for Conrad to find him.

<answer>:

A