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

<passage>:
... and it comes out here By LESTER DEL REY Illustrated by DON SIBLEY with ... everything has a beginning and an end. But some men aren't sane thus it isn't always so! like him. But it's a longish story, and you might as well let me in. You will, you know, so why quibble about it? At least, you always have ... or do ... or will. I don't know, verbs get all mixed up. We don't have the right attitude toward tenses for a situation like this. Thanks. You think you're crazy, of course, but you'll find out you aren't. It's just that things are a bit confused. And don't look at the machine out there too long—until you get used to it, you'll find it's years. And you can look at the revenue stamp date, if you still doubt my story. You'll believe it eventually, though, so it doesn't matter. of the same people. You sense things. So I'll simply go ahead talking for half an hour or so, until you get over it. After that you'll come along with me. You know, I could try to change things around by telling same thing in the same words, even if I tried—and I don't intend to try. I've gotten past that stage in worrying about all this. So let's begin when you get up in half an hour and come out with me. You'll take a closer look at the machine, then. Yes, it'll be pretty you'll want to go along. I'll be tired of talking by then, and in a hurry to get going. So I it is probably the field that prevents passage through time from affecting us. The luggage section isn't protected, though. there . You are completely outside of time and space, as best you can guess how things are. that. Well, I asked it after I was told, then I came back and told it to you, and I still can't help answering when you speak. "Not exactly," I try to explain. "Maybe it's no dimension—or it might the machine and I don't understand it." "But...." I let it go, and so do you. If you don't, it's a good way of going then the time-machine. And when you closed the loop by going back and saving yourself the trouble, it got all tangled up. I figured out once that such a universe would need some seven or eight time and space dimensions. It's simpler just to figure that this is the way time got bent back on itself. Maybe there is no machine, and it's just easier for us to imagine it. When you spend thirty years thinking about it, as I did—and you will—you get further and further from an answer. Anyhow, you sit there, watching nothing all around you, and no time, apparently, though there is a time effect back in the luggage space. You look at your watch and it's still running. That means you either carry a small time field with you, or you are catching a small increment of time from the main field. I don't know, and you won't think about that then, either. I'm smoking, and so are you, and the air in the machine is getting a time nor space, apparently. How could the air leak out? You still feel gravity, but I can't explain that, either. Maybe the machine has a gravity field built in, or maybe the time that makes your watch run is easier, though we're in complete darkness, except for the weak light in the machine, which always burns, and a few feet of rough dirty cement of simple, short-limbed, one-piece affair I put on, but it feels comfortable. "I'm staying here," I tell you. "This is like the things they wear in this century, as near as I can remember it, and I should be able to pass fairly well. I've had all my fortune—the one you make on that atomic generator—invested in such a way I can get it on using some anyway?" I'd told you that, too, but you've forgotten. "As near as I can guess, it's about 2150. He told me, just as I'm telling you, that it's an interstellar civilization." But there is only a single picture of a dull-looking metal sphere, with passengers moving up a ramp, and the office is closed. You begin to get the hang of the spelling they use, though. Now there are people around you, but nobody pays much attention to you. "Downayer rien turn lefa the sign. Stoo bloss," he tells you. Around you, you hear some pretty normal English, but there are others using stuff as garbled as his. The educated and uneducated? I don't know. go home. But then a guard comes to the gate. Except for the short legs in his suit and the friendly grin on his face, he looks like any other "Thanks," you mutter, wondering what kind of civilization can produce hobby with me, sir. I've read everything I could get on the period. Oh—congratulations on your pronunciation. Sounds just like some of our oldest tapes." "Souvenir," it announces in a well-modulated voice. "This is a typical in size. You can have it made into a ring on the third floor during morning hours for one-tenth credit. If you have more than one child, lot smaller than you thought. They seem to be in chronological order, and the latest one, marked 2147—Rincs Dyn*pat: You study it, but it mentions casually the inventor, without giving his name. Either they don't know it, or they take it for granted that everyone does, which seems more probable. They call attention to the chosen cyclic rate from direct current to one thousand megacycles, and any amperage up to one thousand, its maximum power output being fifty kilowatts, limited by the current-carrying capacity of the outputs. They also mention that the operating principle is still being investigated, and that only such refinements as better alloys and the each side. "Nice," the guard says over your shoulder. "It finally wore out one of something out of his pocket and stares at it. "Fine, fine. The mayor of Altasecarba—Centaurian, you know—is arriving, but I'll be back in about ten minutes. He wants to examine some of the weapons for a monograph on Centaurian primitives compared to nineteenth century man. You'll pardon me?" it, since the gravostatic plate is being renewed. Well, you won't be able to change the time cycle by doing anything I maybe some of it helps. I've tried to remember how much I remembered, after he told me, but I can't be sure. So I'll keep on talking. I probably can't help it, anyhow. Pre-set, you might say. You stumble down the stairs, feeling all the futuristic rays in the an appearance schedule. But you should have come to me." He reaches out and taps a pedestrian lightly on the shoulder. "Sir, an emergency request. Would you help this gentleman?" good thing I knew the production office of 'Atoms and Axioms' was in this building. Just let us know when you're finished with the model and years"—and you begin waiting for the air to get stale. It doesn't because there is only one of you this time. Instead, everything flashes off and you're sitting in the machine in your own back yard. You'll figure out the cycle in more details later. You get into the It isn't hard to disassemble, but you don't learn a thing just some And with the controls set at 120 volts, 60 cycles and 15 amperes, you get just that. You don't need the power company any more. And you feel a little happier when you realize that the luggage space wasn't the makeshift job you've just done. But you begin getting more of a jolt when you find that the papers are common as Ampere, or Faraday, or any other spelled without a capital But now.... Well, the drinks are finished. You're woozy enough to go along with me without protest, and I want to find out just why those people up there came looking for you and shouting, before the time machine left.

<question>:
Which word doesn't describe the people of this futuristic city?

<options>:
A helpful
B oblivious
C happy
D busy

<answer>:

D