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

<passage>:
ACCIDENTAL DEATH BY PETER BAILY The most dangerous of weapons is the one you don't know is loaded. Illustrated by Schoenherr one after another in defiance of probability? and is operated by a hand-picked crew of highly trained men in perfect condition, how often is it wrecked planetful of them do? "On the other hand, a talent that manipulates chance events is bound to be chancy. No matter how highly developed it can't be surefire. The precipice it fingered and wrenched flashed at the furrow's end on a thing of metal and plastics, an artifact thrown down in the dead wilderness. Transcriber's Note: Astounding Science Fiction broken or a clockwork toy running down. When the movements stopped, sound began. Thin, scratchy, inaudible there was a click and a strange but still cocky, there leaked from the by a series of silly errors happening human voice. out. I'm fine where I am. I'll just lie here for a while and relax, and get well use it. That way even if I'm not and wonder what went wrong. "I suppose I'm in a state of shock. Who wouldn't be shocked after luck like that? "I've always been lucky, I guess. "You'll want to know if the ship Alpha Centauri doubt if it was the ship itself that fouled things up. "That was some survey assignment. "I'm shocked all right. I never said astronomical survey in the starship "Where had I got to? I'd told you at fifteen p.s.i. The odds against finding Chang on a six-sun technical—haven't got space travel for instance. They're good astronomers, their way, they're a highly civilized people. Look more like cats than people, but they're people all right. If you doubt it, chew these facts over. in four weeks. When I say they, I . "Three, they've a great sense of humor. Ran rather to silly practical jokes, but still. Can't say I care for that hot-foot and belly-laugh stuff myself, but tastes differ. "Four, the ten-man language team also learned chess and table tennis. "But why go on? People who talk English, drink beer, like jokes and beat me at chess or table-tennis are people for my money, even if they look like tigers in trousers. "It was funny the way they won all the time at table tennis. They certainly weren't so hot at it. Maybe off our strokes. As for chess, Svendlov was our champion. He won sometimes. The rest of us seemed to lose whichever Chingsi we played. There again it wasn't so much that they were good. How could they be, in the time? It was more that we all seemed to make silly mistakes when we played them and that's fatal in chess. Of course it's a screwy situation, playing chess with something that grows its own fur coat, has yellow you have kept your mind on the game? "And don't think I fell victim to their feline charm. The children were pets, but you didn't feel like patting the adults on their big grinning heads. Personally I didn't like the one I knew best. He was called—well, we or whatever you like to call him, who came back with us. Why I disliked him was because he was always trying to get the edge on you. All the time he had to be top. Great sense of humor, of course. I nearly broke my neck on that butter-slide he fixed up in the metal alleyway to the engine room. Charley laughed even laughed myself though doing it hurt me more than the tumble had. Yes, life and soul of the party, old Charley ... was a cabin full of dead and dying men, the sweetish stink of burned flesh and the choking reek of scorching insulation, the boat jolting and shuddering "My God, it's dark out here. Wonder how high I am. Must be all of "That's better. Why didn't I close "It's getting lighter. Look at those peaks down there! Like great knives. I don't seem to be falling as fast as and tell the world hello. Hello, earth is that the suit ran out of "Come to think of it, why not longer and get properly rested up before I try anything big like standing up. "I was telling about the return and Mars. Instead of which, when except the noise-level of the universe. solar system. The crew had to find out exactly what went wrong. The physicists had to make mystic passes in front of meters and mutter about residual folds in stress-free space. translated into the somewhat abstruse Nothing was wrong with the computer. Nothing was wrong with the engines. We'd hit the right button and we'd gone to the place we'd aimed for. All we'd done was aim for the wrong place. It hurts me to tell with no space-flight tradition. In practical terms, one highly trained crew member had punched a wrong pattern of holes on the tape. Another equally skilled had failed to notice this when reading back. A childish error, highly improbable thus squaring the improbability. were cross-checked about five times. I got sick so I climbed into a spacesuit and went outside and took some was still chuckling and shaking his "Everything twanged like a bowstring. Whale , the most powerful "The interplanetary flight because you can high exhaust velocity. But in it has rather a low thrust. It would at a dead run. There was no time to take anything at all except the clothes asteroids. In addition to the ion drive thanked God for that when Cazamian with the ship, as the saying is? Not Or did he suspect another human error? the cabin was filling with fumes. I how he'd escaped—and I earth fifty miles below. I shut my I don't see how any of us could have survived. I think we're all dead. "I'll have to get up and crack this I'm dead so I can't stand up." There was silence for a while except for the vicious howl of the wind. "Hello there. I'm in the bleakest jumps. Terminal velocity for a human body falling through air is Falling fifty miles is no worse than foot fall, true, but I've been lucky. The suit is bulky but light and probably "The second thing I want to say is about the Chingsi, and here it is: watch out for them. Those jokers are dangerous. I'm not telling how because I've got a scientific reputation to watch. You'll have to figure it out for yourselves. Here are the clues: (1) The Chingsi talk and laugh but after all they aren't human. On an alien world a hundred light-years away, why shouldn't alien so uncertain and rudimentary here that most people don't believe it, might be highly developed the ship, we lost the launch, all but one of us lost our lives. We couldn't even win a game of ping-pong. "So what is luck, good or bad? Scientifically speaking, future chance events are by definition chance. They can turn out favorable or not. When occurred unfavorably, you've got bad luck. It's a fancy name for a lot of chance results that didn't go your way. But the gambler defines it differently. For him, luck refers to the future, and you've got bad luck when future chance events won't go your way. Scientific investigations into this have been inconclusive, but everyone knows that some people are lucky and others aren't. All we've got are hints a rudimentary talent. There's the evil eye legend and the Jonah, bad luck bringers. Superstition? Maybe but ask the insurance companies about accident prones. What's in a name? Call a man unlucky and you're superstitious. Call him accident prone and that's sound business sense. I've said enough. "All the same, search the space-flight

<question>:
Why does the narrator say that the aliens' jokes are dangerous?

<options>:
A The wrong kind of joke could end in catastrophe
B It hurts the scientists' reputations to be beat at games like chess
C Their practical jokes tend to meddle with spaceship parts
D They like to play with weapons and people tend to die

<answer>:

A