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

<passage>:
from the wonderful future ... and though he didn't want to ... nevertheless he did.... Betty mildly, "You're late." "Don't yell at me, I almost as though reciting, "What I need is a vacation." "Providence," Simon told her whilst fiddling with the aspirin bottle, "Lost track," Arth said. "You can come home with me." "I'm not selfish," Betty said. "All Betty bounced up with Olympic out the window, that the Germans were certainly the most modern, futuristic people in the world. But I "You didn't have a hotel. What a stupidity. I'll be phased. Phased all the way down." got to get my bag. Oh, my head. "Anything," Simon said. "Only one exception." "Excellent. Do you believe in time travel?" Simon said nothing. Across the Where did we spend last night?" seat, Betty cleared her throat. When Simon continued to say nothing she ventured, "Time travel is impossible." "Why?" "Why?" Betty looked to her boss for assistance. definite answer. She said, "Well, for one thing, paradox. Suppose you had a time machine and traveled back a hundred years or so and killed your own great-grandfather. Then how could you ever be born?" "Confound it if I know," the little 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. Betty was too far in now to maintain her proper role of silent secretary. "Time travelers," she said, not very intelligently. The potential client sat more erect, and then remembered. "I've "Then you'll realize that there are a dozen explanations of the paradoxes of time travel. Every writer in 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 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 explanation, Betty, is that they can't afford to allow the space-time continuum track to be altered. If, say, a time traveler returned to a period of twenty-five years ago and shot Hitler, then all subsequent history would be changed. In that case, the time traveler himself might never be born. They have to tread mighty carefully." at the luggage checking station, but the attendant there evidently couldn't expect you to be so well informed on the subject, young man." again with the aspirin bottle. Mr. Oyster went on. "I've been no use prolonging this. As I understand it, you're an elderly gentleman a cab to the airport, presented my return ticket, told them I wanted to leave on the first obtainable plane to New York. I'd spent two days at the with a considerable fortune and you nodded. 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 realize that thus far nobody has succeeded the future will have discovered. You're willing to pony up a part of this fortune of yours, if I can deliver a bona fide time traveler." "Right!" Betty had been looking from one on that project for at least a couple of hours. Not only wasn't the bag check in with Betty. it five—days before when I'd left. I'd lost track of the time. Betty and Simon waited. such a bang-up time they've been holding it every year since. The "You've been acting sick all morning. 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 You went out that door about Betty said, "What's the matter not half an hour ago, just before this marble-missing client came in." She added, irrelevantly, "Time travelers yet." I tried just once more. "Uh, when did you first see this Mr. Oyster?" Oktoberfest . For one thing, a time traveler wouldn't be conspicuous. At a festival like this somebody with a strange accent, or 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 . 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 how long ago did I go out that door—on the way to the airport?" ten minutes ago, were gone about three minutes, and then came back." back a few thousand years, the things you would wish to see would be a Roman Triumph, perhaps the Rites of Dionysus, or one of Alexander's orgies. You wouldn't want to wander to study a people than when they could go you've done it. Confound it. However, I suppose your time, even when event, both for the sake of actual interest and for protection against being Betty looked at him admiringly. wages," she said. "I suppose that's you've been yearning about." "I did," Simon groaned. "Three times." Betty stared at him. "You mean—" Simon nodded, miserably. Simon fortune—" "Sorry," Simon said. "Can't be true, you should have gone back again to Munich. If there was one time traveler, there might have been—" "I keep telling you," Simon said . Fifty thousand 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 in his voice. "A fifty thousand dollar bonus if you bring me a time traveler." "Out of the question," Simon said. continuum track being altered. If something comes up that looks like you—all over again. They just can't allow anything to come back from the future and change the past." "You mean," Betty was suddenly "Just for laughs," Simon told the The future! Just think!" Simon said wearily, "There's just one thing you can bring back with you from the future, a hangover compounded of a gallon or so of Marzenbräu. I spent the time planning the fun I was going to have. again." THE END hours from Gander to Shannon and I spent that time dreaming up material 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 It takes roughly seven and a half I could put into my reports to Transcriber's Note: attended annually. Where did five million people a population of less than a million, counting children. ponied up all the money for such expenditures? How could the average bag, told me they'd do what they could, and to report back in a few hours. I had another suspicious twinge. If five million people attended this Theresienwiese , the fair about five thousand persons and from six to ten thousands pack themselves risk a considerable portion of my tourists as could have been dreamed up, ranging from a seventy- or eighty-year-old couple in Bavarian A desperate waitress bearing six mugs of beer in each hand scurried past. They call them masses , by the done." way, not mugs. The bald-headed masses over to us and then hustled on. dollars bonus. If that story was A mass 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 bitterly, "I went back there three changed, they set you right back at the beginning and let things start—for

<question>:
What profession do Betty and Simon share?

<options>:
A Advertisers
B Detectives
C Department store clerks
D Time travelers

<answer>:

B