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

<passage>:
UNBORN he said finally. "Maybe we ought to be getting on to the Unfortunately , there was only one thing he could bring back from the wonderful future ... and though he didn't want to ... nevertheless he did.... "Vegetarian," he said. "Couldn't possibly eat meat. Barbarous. Ugh." "Well, we need some nourishment," Betty TOMORROW BY MACK REYNOLDS Arth closed his eyes in pain. her. He sat down at his desk, passed his tongue over his teeth in distaste, groaned, fumbled in a drawer for the aspirin bottle. to use for money?" "Providence," Simon told her whilst fiddling with the aspirin bottle, "will provide." That seemed like a good question. I thought about it for a while. Finally turned up a missing jewel deal, say. Something where you could deduce that actually the ruby ring had gone down the drain and was caught in the elbow. Something that would net about fifty dollars." "Fifty dollars? Why not make it five "Money," Simon said. "When you took this job you said it was the romance that appealed to you." "Hm-m-m. I didn't know most sleuthing amounted to snooping around department stores to check on Simon said, enigmatically, "Now Betty bounced up with Olympic were certainly the most modern, futuristic people in the world. But I couldn't stand the light. "Where's the shade," I moaned. Arth did something and the window went opaque. "That's quite a gadget," I groaned. "Good morning, Mr. Oyster." He indicated "If I didn't feel so lousy, I'd Simon said unenthusiastically, "You haven't got a handful of aspirin, have you?" I asked him. undoubtedly was a bathroom. "Stay where you are. Don't move. Don't touch anything." "All right," I told him plaintively. "I'm clean. I won't mess up the place. All I've got is a hangover, not lice." "Why?" "Why?" "Yes, why?" Betty looked to her boss for assistance. definite answer. She said, "Well, for one thing, paradox. Suppose you own great-grandfather. Then how could you ever be born?" "Confound it if I know," the little fellow growled. "How?" Simon said, "Let's get to the point, what you wanted to see me about." "I want to hire you to hunt me up some time travelers," the old boy said. obviously with intent to hold the floor for a time. He removed the the field worth his salt has explained them away. But to get on. It's my contention that within a century or so man will have solved the problems of immortality and eternal youth, and it's also my suspicion that he will eventually be able to travel in time. So convinced am I of these possibilities that I am willing to gamble a portion of my fortune to investigate the presence in our era of such time Simon seemed incapable of carrying said, "But ... Mr. Oyster, if the explanation, Betty, is that they can't afford to allow the space-time continuum make heads nor tails of the check receipt. He didn't speak English and track to be altered. If, say, a himself might never be born. They have to tread mighty carefully." Mr. Oyster was pleased. "I didn't Mr. Oyster went on. "I've been considering the matter for some time and—" Simon held up a hand. "There's no use prolonging this. As I understand realize that thus far nobody has succeeded in taking it with him." Mr. Oyster returned his glasses to their perch, bug-eyed Simon, but then Simon said, "You want to hire me to find a time traveler and in some manner or other—any manner will do—exhort from him the secret of eternal life and youth, which you figure the future will have discovered. "But where are you going to find one of these characters—especially if they're interested in keeping hid?" The old boy was the center again. "I told you I'd been considering it check in with Betty. found Mr. Oyster sitting in the chair , that's where they'd be!" He seemed for some time. The Betty and Simon waited. Oktoberfest you came for? Impatient to hear if I'd had any results?" My mind was spinning like a whirling dervish in think of to show for it nothing but "Came for?" Mr. Oyster snorted. party." He began to swing into the spirit of his description. "It originally started in celebration of the wedding of some local prince a century Mr. Oyster was saying something to the effect that if I didn't leave today, it would have to be tomorrow, that he hadn't ponied up that thousand dollars advance for anything less than immediate service. Stuffing his receipt in his wallet, he fussed "All right," Simon said. "We'll accept did you first see this Mr. Oyster?" who didn't know exactly how to wear his clothes correctly, or was off the ordinary in any of a dozen other ways, wouldn't be noticed. You could be a four-armed space traveler from Mars, and you still wouldn't be conspicuous at the Oktoberfest . People would figure they had D.T.'s." "But why would a time traveler want to go to a—" Betty began. "Why not! What better opportunity to study a people than when they "See here," Mr. Oyster said (interrupting are in their cups? If you say this was supposed to be amusing, young man? I don't find it so. In Simon's story), "did you of Dionysus, or one of Alexander's orgies. You wouldn't want to wander more." "I'm not interested in more," Mr. particularly when you might be revealed as a suspicious character not being able to speak the language, not Athens while nothing was going on, knowing how to wear the clothes and you'd have to stick to some great event, both for the sake of actual interest and for protection against being unmasked." The old boy wound it up. "Well, that's the story. What are your rates? one way of taking care of a crackpot. But I'm surprised you didn't Mr. Oyster was taken aback himself. "See here, young man, I realize this isn't an ordinary assignment, Simon risk a considerable portion of my fortune—" "Sorry," Simon said. "Can't be Mr. Oyster said quietly. "I times. There were hundreds of them. Probably thousands." He took a deep breath. "Listen, we're just going to have to forget about it. They're not going to stand for the space-time continuum track being altered. If something comes up that looks like it might result in the track being "Out of the question," Simon said. "But why ?" Betty wailed. "Just for laughs," Simon told the two of them sourly, "suppose I tell furious at him, "you've given up! Why this is the biggest thing— Why the fifty thousand dollars is nothing. Oyster (Simon began) in the way "You mean," Betty was suddenly can't allow anything to come back from the future and change the you a funny story. It goes like on top of that!" He shuddered. "If you think I'm Mr. Oyster. I was going to have to give him some kind of report for his money. Time travel yet! What a laugh! ponied up all the money for such expenditures? How could the average German, with his twenty-five dollars a week salary? down, pocketed the husky bribe, showed me where I could check my that Mr. Oyster mentioned. Each tent fräuleins darted about pull. He looked at me, waiting. I came up. "Mistaken," I admitted. in the papers." "No go," Simon said, a sad quality asked him, in the way of making conversation.

<question>:
Why does Mr. Oyster want to hire Simon and Betty?

<options>:
A He thinks the time traveler will have the secret to never-ending youth.
B He wants to know the secret of time travel and they are the best investigators around.
C He wants to make sure his family's wealth continues in the future.
D He wants to find out a secret for political reasons.

<answer>:

A