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

<passage>:
the U.S. copyright on this publication was renewed.] The most dangerous is not the outlawed murderer, who only slays men, but the rebellious philosopher: for he destroys worlds. Darkness and the chill glitter of stars. Bo Jonsson crouched on a catfooting too softly to set up vibrations. A man could do that when gravity was feeble enough. had been alone among them before he had almost thought them friends. 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 fear he wouldn't be able to stop. Let's face it , he told himself. 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 departure. "Nothing to compare," he insisted. "Every place else is getting too fantangling civilized, except Venus, and I don't enjoy Venus." 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 himself bright, and always wanted to learn. think the eminent Dr. McKittrick is gonna be interested in sociability, Bo kept on sipping slowly. "Johnny," he said, raising his voice to cut knowing more math and physical science than the average professor on Earth. So you had to work your way through the Academy and never had a chance to fan yourself with a lily white hand while somebody tootled Mozart through a horn. So what?" Johnny's head darted around, birdlike. "I don't, Johnny," said Bo. "I'll just nurse a beer." It wasn't morals himself and Johnny 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 space trip is expensive 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 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 inspection of the ship tomorrow, and grudged the cost of anti-hangover 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 arguing with Johnny. His face was ugly with anger. It was the only clear thought which ran in the sudden storm of Bo's head. his enemy was not there. He turned the thought over in a mind which seemed stiff and slow. By the asteroid entirely, there was its low acceleration to keep a man near the ground fever. He hung on the edge of creation by his fingertips, while chaos shouted beneath. 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 and laid him in the barren ground to wait, unchanging now, till Judgement Day. He felt empty then, drained of grief and hope alike, his main thought a dull dread of having to tell Johnny's father when strewn for nothing. She looked impatiently at him out of the screen. "Well," she said, "what's the matter? I thought we were blasting today." "Hadn't you heard?" asked Bo. He found it hard to believe she could "Johnny's dead. We can't leave." "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 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 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, 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 herself, Dr. McKittrick's fame had spread through more thousands of people and millions of miles than her professional achievements were ever likely to reach. 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. the evening he found himself weeping. He woke up many hours later. Achilles ran on Earth time but did not rotate on it a cargo of refined thorium for Earth while she lay in orbit, she had somehow lost a few hundred pounds of reaction-mass water from a cracked gasket. Why the accident should have occurred, nobody knew ... spacemen 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 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 "Oh, yes. I had some fool idea about settling but soon learned better. I tried to farm, but when you have to carve your own land out of modified, no trip ever turned out just as predicted, but that could be done when needed with a slipstick and the little ship's calculator. Bo went at his share of the job doggedly, checking and re-checking before giving the problem to the machine Lundgard breezed through it and spent his time while waiting for Bo in swapping dirty limericks not to howl with the fury ripping in his nerves. His body was slow, inert, a thing to fight. There was no more feeling in his back, was he dead already? Redness flamed before his eyes, red like Valeria's hair blowing across hours worth left. Lundgard could kill him simply by waiting. It would be easy to die. He lay on his back, staring up at the stars and the spilling cloudy glory of the Milky Way. A warmth was creeping back into numbed hands and feet soon he would be warm all over, and sleepy. His eyelids felt heavy, strange that they should be so heavy on an asteroid. He wanted terribly to sleep.

<question>:
Why did Johnny say Dr. McKittrick wasn't sociable?

<options>:
A She was very intelligent
B She wasn't beautiful
C She was young
D She was too focused on her work

<answer>:

D