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

<passage>:
The old man Pop heard of the quaint commercial enterprise through the micro-tapes just wanted to get back his put off at the shack for the men learned of it the same way. Pop didn't even think of it again. It seemed to have nothing to do with him. But Sattell undoubtedly dealt with it Pop matter-of-factly tended the Sattell and he had reason not to popping up in his recollection. Times when he was happy. One day he remembered the puppy his children had owned and loved. He drew it painstakingly—and it was his again. Thereafter he could remember actually recover a completely vanished past. He envisioned a way to increase Pop received the stores and took care of them. He handed over for the colony and the rocket landing field and the shack. The reason for Pop was something else. Pop continued to search absorbedly for material with which to capture and in his spare time he worked industriously at recovering some He thought often of Sattell, down He twitched all over. Then he struck cruelly again at Pop Young's happily tell himself that it feels delicious. Sometimes it does. But Sattell couldn't comfort himself so easily. He knew about Pop, up on the surface. He'd shipped out, whimpering, to the Moon to get far beginning—produced. It was meaningless Sattell got the shakes when he thought of Pop, and Pop rather probably knew it. Of course, by the time he took the job tending the shack, he was pretty certain about Sattell. The facts spoke for themselves. Pop had come back to consciousness in a hospital with a great wound in his head and no memory containing a hundred Earth-pounds weight of richness. Pop reached the rocketship. He about Pop Young's shack in cannisters was stronger, the doctors told him who he was, and as gently as possible what had happened to his wife them. But he didn't remember a thing. Not then. It was something of a blessing. But when he was physically recovered he set about trying to pick no longer remember. He met Sattell quite by accident. Sattell looked familiar. and frantically denied that he'd ever seen Pop before. All of which happened back on Earth and a long time ago. It seemed to Pop that the sight of Sattell had though, and he hunted up Sattell Pop simply gaped. He couldn't And Sattell went into panic when he returned. Nowadays, by the Big Crack, Pop wasn't so insistent on seeing Sattell, but he was deeply concerned with the recovery of the memories that Sattell helped bring back. Pop was a highly conscientious man. He took good care of his job. There was a but that trace of luxury remained. Pop gazed at the plastic, fascinated. Bring them here! Understand?" Pop said numbly: "What the hell?" Tell Sattell I'm here and he can of Sattell. He knew he had plenty Sattell knowing what had happened to his wife and children, but it was hearsay only. He had no memory of them at all. But Sattell stirred the lost memories. At first Pop followed absorbedly from city to city, to recover the years that had been wiped out by an axe-blow. He did recover a good deal. When Sattell fled to another continent, Pop followed because he had some distinct memories of his wife—and the way he'd felt about her—and some fugitive mental images of his children. When Sattell frenziedly tried to deny knowledge of the murder in Tangier, Pop had come to remember both his children and some of the happiness of his married life. savagery due to terror. But, of course, Pop was helpless to resent killed his family. If so, Sattell had profited by less than two days' pay for wiping out everything that Pop possessed. But Pop wanted it back. He couldn't prove Sattell's guilt. he didn't really want Sattell to die. If he did, there'd be no way to recover Somehow, the mention of Sattell had more lost memories. Sometimes, in the shack on the far odd fancies about Sattell. There was side of the Moon, Pop Young had detail. He knew Sattell. That part sometimes Pop wondered if Sattell ever thought of the value of the and Pop and the colony together. "I'd guess," said Pop painstakingly, "that Sattell figured it out. He's "No," said Pop, "they'll do it anyhow. If we were able to tell about to scream. But not Pop. He'd come to the memories of times when he was a young man with a young wife who loved him extravagantly. Then pictures of his children came out of emptiness and grew sharp and clear. He found that he loved them very dearly. And when he was near Sattell he literally recovered them—in the sense that he came to know new things about them and had new memories of them every day. He hadn't yet remembered the crime which lost them to him. Until he did—and the fact possessed a certain grisly humor—Pop didn't even hate Sattell. He simply wanted to be near him because it enabled him to recover new and vivid parts of his youth that had been lost. Pop regarded his drawings meditatively. A sketch of his wife as he now remembered her. It was very the child had really looked exactly two children, playing together. He looked forward to remembering like that! Later he began a sketch of satisfaction. "That'll do it!" He tore bed linen from his bunk and worked on the emptied cannister. quite take it in. they were warmed to touchability. Pop packed the cotton cloth in the container. He hurried a little, because how she looked: the almost-smug But, outside, nothing ever happened. together for always, with one complete Working on his memories, one day Pop made a little sketch. It helped a great deal. He grew deeply Inside, it was quite different. Sattell, he suddenly recovered a completely new memory. On their first wedding anniversary, so long ago, he and his wife had gone out to his partly-remembered wife. In time—he had plenty—it became a really truthful likeness. dinner to celebrate. He remembered joy they shared that they would be Pop reflected hungrily that it was something else to be made permanent and inspected from time to time. But he wanted more than a drawing of this! He wanted to make the memory permanent and to extend it— If it had not been for his vacuum suit and the cannister he carried, Pop year for proof. would have rubbed his hands. clearly when he thought of Sattell, so by keeping Sattell in mind he recovered the memory of a chair that had been in his forgotten home. Sattell had no such device for adjusting some retaliation so horrible and lingering that it was worth waiting for. He came to hate Pop with an insane ferocity. And fear. In his mind the need to escape became an obsession But he was helpless. He couldn't leave. There was Pop. He couldn't kill Pop. He had no chance—and he was afraid. The one absurd, irrelevant thing he could do was write own affairs with fascinated attention. But then an event occurred which bore directly upon Pop Young and Sattell and Pop Young's missing What do we do?" "Don't do a thing," advised Pop. "It's all right. I blew up the ship and the plastic zestfully on the table where he'd been restricted to drawing pictures of his wife and children in order to recover memories of them. to do with Pop or with Sattell. But He began to plan, gloatingly, the worked, he'd think of Sattell, because that was the way to get back the missing portions of his life—the parts Sattell had managed to get away from him. He'd get back more if he ever remembered the crime Sattell had committed. He felt, somehow, that he wouldn't get that back until he'd recovered all the rest. Gloating, it was amusing to remember what people used to call tell Sattell a thing about it, if I were

<question>:
What effect does Sattell's proximity have on Pop?

<options>:
A It brings Pop's memory of the murder of his family into clarity
B It motivates him to plot his revenge against his family's murderer
C It amplifies the pain of his Pop's head injury
D It restores Pop's memories of his wife and children

<answer>:

D