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

<passage>:
Unfortunately , there was only one thing he could bring back from the wonderful future ... and though he didn't want to ... nevertheless he did.... He looked over at Betty and said, almost as though reciting, "What I need is a vacation." "Providence," Simon told her whilst fiddling with the aspirin bottle, "will provide." "Hm-m-m. But before providing vacations it'd be nice if Providence turned up a missing jewel deal, say. Something where you could deduce I hustled back to the apartment and go?" "Lost track," Arth said. "You can come home with me." Simon said, enigmatically, "Now caste whatever the styling. Simon said unenthusiastically, "Good morning, Mr. Oyster." He indicated the client's chair. "Sit down, sir." Simon, said finally, "You know one exception." "Excellent. Do you believe in time travel?" Simon continued to say nothing she this marble-missing client came 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. in." She added, irrelevantly, "Time her proper role of silent secretary. "Time travelers," she said, not Betty was too far in now to maintain the presence in our era of such time obviously with intent to hold the floor for a time. He removed the and then remembered. "I've got to get my bag. Oh, my head. Where did we spend last night?" I've got to go to the Bahnhof and 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 get my luggage." Arth didn't put up an argument on that. We said good-by and I could travelers." Simon seemed incapable of carrying the ball this morning, so Betty said, "But ... Mr. Oyster, if the future has developed time travel why don't we ever meet such travelers?" Simon put in a word. "The usual portion of my fortune to investigate afford to allow the space-time continuum track to be altered. If, say, a time traveler returned to a period of make heads nor tails of the check then all subsequent history would be changed. In that case, the time traveler himself might never be born. They have to tread mighty carefully." Mr. Oyster was pleased. "I didn't expect you to be so well informed on the subject, young man." Simon shrugged and fumbled again with the aspirin bottle. Mr. Oyster went on. "I've been considering the matter for some time and—" Simon held up a hand. "There's I decided the hell with it. I took a cab to the airport, presented my return 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 nodded. Simon said, "You want to hire me Oktoberfest , and I'd had it. to find a time traveler and in some manner or other—any manner will do—exhort from him the secret of You're willing to pony up a part of this fortune of yours, if I can deliver a bona fide time traveler." "Right!" evidently. The trip back was as uninteresting have stayed, I told myself. From Idlewild, I came directly to the office rather than going to my as the one over. As the hangover began check in with Betty. I opened the door and there I found Mr. Oyster sitting in the chair he had been occupying four—or was it five—days before when I'd left. Oktoberfest , that's where they'd be!" He seemed Oktoberfest ," he repeated. "The greatest festival the world has twenty-five years ago and shot Hitler, the last stages of a grand-daddy hangover. "Came for?" Mr. Oyster snorted. "I'm merely waiting for your girl to make out my receipt. I thought you receipt. He didn't speak English and over to my desk and looked down at the calendar. 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 Oktoberfest is one whale travelers yet." I tried just once more. "Uh, when did you first see this Mr. Oyster?" "Never saw him before in my Oktoberfest . For one thing, a time traveler wouldn't life," she said. "Not until he came be conspicuous. At a festival like this somebody with a strange accent, or Oktoberfest . People would figure they had D.T.'s." "But why would a time traveler want to go to a—" Betty began. ten minutes ago, were gone about three minutes, and then came back." "See here," Mr. Oyster said (interrupting Simon's story), "did you say this was supposed to be amusing, "Why not! What better opportunity Simon shrugged, put one hand to more." "I'm not interested in more," Mr. Oyster said. "I suppose your point was to show me how ridiculous the whole idea actually is. Very well, event, both for the sake of actual interest and for protection against being with a considerable fortune and you Simon winced at the noise, took Oktoberfest starts on Friday and continues for sixteen days. You can one way of taking care of a crackpot. But I'm surprised you didn't take his money and enjoy that vacation Simon was shaking his head. "Not at him. Mr. Oyster was taken aback himself. "See here, young man, I realize this isn't an ordinary assignment, you've been yearning about." Simon Simon nodded, miserably. "I did," Simon groaned. "Three done." "A hundred dollars a day plus expenses," Mr. Oyster said quietly. "I like the fact that you already seem to have some interest and knowledge time traveler, there might have been—" "I keep telling you," Simon said ticket, told them I wanted to leave on the first obtainable plane to New York. I'd spent two days at the "A fifty thousand dollar bonus if you bring me a time traveler." "Out of the question," Simon said. "Just for laughs," Simon told the this:" I got a thousand dollars from Mr. Oyster (Simon began) in the way of an advance, and leaving him with Betty who was making out a receipt, I got more guff there. Something packed a bag. Hell, I'd wanted a vacation anyway, this was a natural. On the way to Idlewild I stopped off at Simon said wearily, "There's just one thing you can bring back with you from the future, a hangover compounded hours to get to Gander from Idlewild. I spent the time planning the fun I was going to have. of a gallon or so of Marzenbräu. I could put into my reports to Mr. Oyster. I was going to have to give him some kind of report for his money. Time travel yet! What a laugh! Between Shannon and Munich a was fouled up, some clerk's error, back into place, she glared unbelievingly bag, told me they'd do what they could, and to report back in a few hours. the Munich area, each of them represented by one of the circuslike tents that Mr. Oyster mentioned. Each tent contained benches and tables for apartment. I figured I might as well true, you should have gone back again to Munich. If there was one didn't seem to hang together very well. "My pilgrimage," he told me. "All my life I've been wanting to go back to an Oktoberfest mass . "I'll help you," I told him. "Very noble endeavor. Name is Simon."

<question>:
How has Simon manipulated Mr. Oyster?

<options>:
A He has traveled back in time thrice to attempt to bring back a time traveler
B He has taken over $50,000 of Mr. Oyster's money based on unfulfilled investigations
C He has discovered that Mr. Oyster is actually Arth from several decades ago
D He has used the opportunity to travel to Oktoberfest on vacation, and never intended to grant Mr. Oyster's request

<answer>:

A