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

<passage>:
Stillness answered him. He gulped a heavy lungful of tainted air and rose. The other might be miles away yet, or perhaps very close, catfooting too softly to set up vibrations. A man could do that when gravity was feeble enough. him, light-years to fall through emptiness before he reached one. He had been alone among them before he had almost thought them friends. Sometimes, on a long watch, a man found himself talking to Vega or them, he did not exist, and they would shine carelessly long after he was gone into night. He had never felt so alone as now, when another man was on the asteroid with him, hunting him down. death. Not till men came and hunted each other. Slowly he forced himself to move. The thrust of his foot sent him up, looping over the cliff to drift down like a dead leaf in Earth's 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. They pushed through a milling crowd at the bar, rockhounds who watched chance to fan yourself with a lily white hand while somebody tootled Mozart through a horn. So what?" Johnny's head darted around, birdlike. "If we want some women we'd better make our reservations now." "I don't, Johnny," said Bo. "I'll just nurse a beer." It wasn't morals so much as fastidiousness stop in the middle of an interplanetary voyage and head for somewhere else but she went wherever there was cargo or people to be moved. Her margin of profit was not great in spite of the charges, for a 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 gravity—the Last Chance didn't centrifuge like some of the tommicker to help, but Johnny faded along and edged up to the girl with his highest-powered smile. There were several other men standing around her, but Johnny had The Touch. He'd be bringing her back here in a few minutes. Bo sighed, feeling a bit lonesome. If he wasn't going to make a night of it, there was no point in drinking heavily. He had to make the final tablets. Besides what he was putting back into the business, he was trying to build a private hoard some day, he'd retire and get married and build a house. He already had the site picked out, on Kullen overlooking the Sound, back on Earth. Man, but it was a long time since As he neared, he caught words: "—my girl, dammit." "Like hell I am!" said the girl. "I never saw you before—" much of an impetus to throw him off this rock entirely. Then his helpless and soon frozen body would be just another meteor for the next 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 spacemen available for immediate hiring are found once in a Venusian snowfall. and laid him in the barren ground to wait, unchanging now, till Judgement Day. He felt empty then, drained of grief and hope alike, It hardly seemed to matter that the Guards office reported itself unable to find the murderer. A single Venusian should have been easy to trace on Achilles, but he seemed to have vanished completely. Bo returned to the transient quarters and dialed Valeria McKittrick. She looked impatiently at him out of the screen. "Well," she said, "what's the matter? I thought we were blasting today." "Oh ... I'm sorry. He was such a nice little man—I've been in the lab all the time, packing my things, and didn't know." A frown crossed her clear brow. "But you've got to get me back. I've engaged passage to Luna with you." "Well ... damn! There won't be another berth for weeks, and I've got to get home. Can't you find somebody?" Bo shrugged, not caring much. "I'll circulate an ad if you want, but—" "Do so, please. Let me know." She switched off. Bo sat for a moment thinking about her. Valeria McKittrick was worth too ... you didn't get to be a physicist with the Union's radiation labs for nothing. He knew she was still young, and that she had been on Achilles for about a year working on some special project and was now ready to go home. She was human enough, had been to most of the officers' parties and danced and laughed and flirted mildly, but even the dullest rockhound gossip knew she was too lost in her work to do more. Out here a woman was rare, and a virtuous woman unheard-of as a result, unknown to Since coming here, on commission from the Lunar lab, to bring her home, Bo Jonsson had given her an occasional wistful thought. He liked 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 a couple of similar affairs in the past and didn't want to go through another. wassail. Already his friend was cold under the stars. In the course of the evening he found himself weeping. He woke up many hours later. Achilles ran on Earth time but did not rotate on it he was to call one Einar Lundgard at the Comet Hotel Lundgard down to the desk. appeared in the screen. Lundgard was a tall and supple man, somehow 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 had come to Achilles to pick up a cargo of refined thorium for Earth while she lay in orbit, she had Bo had heard of it in the course of shop talk. "I thought she went back anyway," he said. Lundgard nodded. "She did. It was the usual question of economics. You know what refined fuel water costs in the Belt also, the delay while we got it would have carried Earth and Achilles past optimum position, which'd make the trip home that much more expensive. Since we had one more man aboard than really required, it was cheaper to leave him behind the difference in mass would make up for the fuel loss. I volunteered, even suggested the idea, because ... well, it happened during my watch, and even if nobody blamed me I couldn't help feeling guilty." Bo understood that kind of loyalty. You couldn't travel space without men who had it. "The Company beamed a message: I'd stay here till their schedule 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 another asteroid to pick up some automatic equipment, and won't go into "Against six months here?" Lundgard laughed Lundgard to be a Spacetech 1/cl with eight years' experience, myself." "Notice a year's gap here," said Bo, pointing to the service record. before giving the problem to the machine Lundgard breezed through it and spent his time while waiting for Bo in swapping dirty limericks her three passengers up to her orbit, they embarked, settled down, and Bo relaxed against the thrust, thinking of Achilles falling away behind them. "So long," he whispered. "So long, Johnny." III hours worth left. Lundgard could kill him simply by waiting.

<question>:
How does Lundgard end up getting left behind and needing a companion back to Earth?

<options>:
A He was waiting behind to try to kill Johnny.
B He basically "took one for the team" for his last crew, as he made a mistake, causing them to need to leave one person behind.  He volunteered to stay.
C He is a criminal on the run, and he had not found a way to escape to Earth yet.
D He stayed behind for a woman, but their relationship dissolved.

<answer>:

B