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

<passage>:
those who needlessly had strewn Malone blood across the heavens from Saturn to the sun. Now—on distant Trojan asteroids—the rendezvous for death was plainly marked. whirling speck of stone and waited for the man who was coming to kill him. gravity was feeble enough. The stars blazed with a cruel wintry brilliance, over him, around him, light-years to fall through emptiness before he reached one. He had been alone among them before he had almost thought them friends. was gone into night. He had never felt so alone as now, when another man was on the asteroid it would have been heavy on Earth, but it was hardly enough to unscrew the stars and reset the machinery of a universe gone awry. He smiled stiffly at the thought. He wanted to laugh too, but checked himself for sweatless. He wondered if he had spoken it aloud. There was plenty of room on the asteroid. At least two hundred square miles, probably more if you allowed for the rough surface. He could skulk around, hide ... and suffocate when his tanked air gave out. He He looked about him. Nothing. No sound, no movement, nothing but the streaming of the constellations as the asteroid spun. Nothing had ever moved here, since the beginning of time when moltenness congealed into death. Not till men came and hunted each other. which was doubtful, he couldn't. Johnny Malone was dead. Maybe that was what had started it all—the death of Johnny Malone. There are numerous reasons for basing on the Trojan asteroids, but the main one can be given in a single word: stability. They stay put in Jupiter's orbit, about sixty degrees ahead and behind, with only minor oscillations spaceships need not waste fuel coming up to a body which has been perturbed a goodly distance from where it was supposed to be. The trailing group is the jumping-off place for trans-Jovian planets, the leading group for the inner worlds—that way, their own revolution about the sun gives the departing ship a welcome boost, while minimizing the effects of Jupiter's drag. Moreover, being dense clusters, they have attracted swarms of miners, so that Achilles among the leaders and Patroclus in the trailers have a permanent boom town atmosphere. Even though a spaceship and equipment represent a large investment, this is one of the last strongholds of genuinely private enterprise: the prospector, the mine owner, the rockhound dreaming of the day when his stake is big enough for him to start out on his own—a race of individualists, rough and noisy and jealous, but living under iron rules of hospitality and rescue. The Last Chance on Achilles has another name, which simply sticks an "r" in the official one even for that planetoid, it is a rowdy bar Venus." flowing tunic and slacks, a beret cocked on his sleek head. But somehow he didn't grate on Bo, they had been partners for several years now. one of Achilles' three live ecdysiasts with hungry eyes, and by some cubicle while Johnny, squinting through a reeking smoke-haze, dialed drinks. Bo was larger and heavier than most spacemen—he'd never have gotten his certificate before the ion drive came in—and was usually content to let others talk while he listened. A placid blond giant, with amiable blue eyes in a battered brown face, he did not consider synthetic alcohol, and a dash of caramel they have the gall to label whiskey and charge for!" "Everything's expensive here," said Bo mildly. "That's why so few rockhounds get rich. They make a lot of money, but they have to spend it just as fast to stay alive." forth a tray with a glass. "C'mon, drink up, man. It's a long way home, and we've got to fortify ourselves for the trip. A bottle, a battle, and a wench is what I need. Most especially the wench, because I don't think the eminent Dr. McKittrick is gonna be interested in sociability, and it's close quarters aboard the Dog ." "Because I am one at heart. Look, Bo, why don't you get over that inferiority complex of yours? A man can't run a spaceship without knowing more math and physical science than the average professor on Sirius (b) her crew, himself and Johnny space trip is expensive but in a few more years they'd be able to buy another ship or two, and eventually Fireball and Triplanetary would be but it was also more effective in low-gee. "'Scuse me," he said. "I see a target. Sure you don't want me to ask if she has a friend?" Bo shook his head and watched his partner move off, swift in the puny trying to build a private hoard some day, he'd retire and get married A spaceman, that. Knows how to handle himself in low-gee. It was the only clear thought which ran in the sudden storm of Bo's head. the asteroid entirely, there was its low acceleration to keep a man near the ground a spaceman, not a rockhound he wasn't used to this environment, and if clamorous in his helmet. He grew dimly aware that it was himself. Then he was falling, whirling down into the black between the stars. with an ultimate cold. or three are required for non-military craft. This is not only an emergency reserve, but a preventive of emergencies, for one man alone might get too tired at the critical moments. Bo knew he wouldn't be allowed to leave Achilles without a certified partner, and unemployed trace on Achilles, but he seemed to have vanished completely. got to get home. Can't you find somebody?" considering. She wasn't beautiful in any conventional sense but she was tall and well built there were good lines in the strong high boned face, and her hair was a cataract of spectacular red. And brains, Achilles for about a year working on some special project and was now intelligent women, and he was getting tired of rootlessness. But of course it would be a catastrophe if he fell in love with her because she wouldn't look twice at a big dumb slob like him. He had sweated out He woke up many hours later. Achilles ran on Earth time but did not soonest. The Comet! Anyone who could afford a room to himself here, rather than a kip in the public barracks, was well fueled. Bo swallowed a tablet "Oh, yes. Are you looking for a spaceman? I heard your ad and I'm available." the slightest trace of accent, less than Bo's. "I thought I was stashed here too for the next several months." "How does a qualified spaceman happen to be marooned?" "I'm with Fireball, was on the Drake —heard of what happened to her?" Bo nodded, for every spaceman knows exactly what every spaceship is doing at any given time. The had come to Achilles to pick up a cargo of refined thorium for Earth while she lay in orbit, she had while we got it would have carried Earth and Achilles past optimum guilty." Bo understood that kind of loyalty. You couldn't travel space without men who had it. permitted an undermanned ship to come by, but that wouldn't be for maybe months," went on Lundgard. "I can't see sitting on this lump that long without so much as a chance at planetfall bonus. If you'll take me I'll get a message to them on the beam right away." "Take us a while to get back," warned Bo. "We're going to stop off at her three passengers up to her orbit, they embarked, settled down, and waited. At the proper time, acceleration jammed them back in a thunder Bo relaxed against the thrust, thinking of Achilles falling away behind He got the pouch open somehow. The stars wheeled around him. There were stars buzzing in his head, like cold white fireflies, buzzing and born again. Born, spewed out of an iron womb into a hollowness of stars and cold, sleepy. His eyelids felt heavy, strange that they should be so heavy on an asteroid. He wanted terribly to sleep.

<question>:
What is Achilles?

<options>:
A A rowdy bar
B An asteroid near Jupiter
C An asteroid near Mars
D A dense cluster

<answer>:

B