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

<passage>:
arch-humanist, the anti-tech killer ... one of those who needlessly had strewn Malone blood Now—on distant Trojan asteroids—the rendezvous for death was plainly marked. [Transcriber's Note: This etext was produced from The most dangerous is not the outlawed murderer, who only slays men, whirling speck of stone and waited for the man who was coming to kill murderer conducted through the ground. with him, hunting him down. fear he wouldn't be able to stop. skulk around, hide ... and suffocate when his tanked air gave out. He had to be a hunter, too, and track down the other man, before he died. And if he found his enemy, he would probably die anyway. death. Not till men came and hunted each other. Slowly he forced himself to move. The thrust of his foot sent him Bo Jonsson's tongue was dry and thick in his mouth. He wanted to find his enemy and give up, buy existence at whatever price it would command. But he couldn't do that. Even if the other man let him do it, 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 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 Bo Jonsson into going there for a final spree before checkoff and getting too fantangling civilized, except Venus, and I don't enjoy Venus." Johnny was from Luna City himself: a small, dark man with the quick nervous movements and dipped accent of that roaring commercial he didn't grate on Bo, they had been partners for several years now. miracle found an empty booth. Bo squeezed his bulk into one side of the it just as fast to stay alive." "Yeh ... yeh ... wish they'd spend some of it on us." Johnny grinned Dog ." Bo kept on sipping slowly. "Johnny," he said, raising his voice to cut "Because I am one at heart. Look, Bo, why don't you get over that 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 he'd wait till they hit Luna. Bo chuckled. The Company consisted of (a) the (b) her crew, himself and Johnny (c) a warehouse, berth, and three other part owners little. Johnny put away another couple of shots and rose. Alcohol cost plenty, 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 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 A sharp noise slashed through the haze of talk and music Bo looked up. There was a tall black haired man, Venusian to judge by his kilts, arguing with Johnny. His face was ugly with anger. Johnny made some reply. Bo heaved up his form and strode toward the discussion, casually picking up anyone in the way and setting him aside. Johnny liked a fight, but this Venusian was big. As he neared, he caught words: "—my girl, dammit." "Like hell I am!" said the girl. "I never saw you before—" "Run along and play, son," said Johnny. "Or do you want me to change that diaper of yours?" That was when it happened. Bo saw the little needler spit from the Venusian's fingers. Johnny stood there a moment, looking foolishly at the dart in his stomach. Then his knees buckled and he fell with a nightmare slowness. only clear thought which ran in the sudden storm of Bo's head. He tangled with another. "Get outta my way!" A roar lifted, someone lifted the jagged end. There was the noise of a fist meeting flesh. Bo had seen death before. That needle wasn't anesthetic, it was poison. He knelt in the riot with Johnny's body in his arms. II Suddenly the world came to an end. There was a sheer drop-off onto the completing his search scheme. Bo stood unmoving an instant, fighting the impulse to leap away. He was was cold on his body. He squinted, trying to see where the shot had There was a knife in his back, it was white-hot and twisting between and freezing its moisture. The knife in him was not hot, it was cold might get too tired at the critical moments. Bo knew he wouldn't be snowfall. Bo didn't care the first day. He had taken Johnny out to Helmet Hill 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 he reached Luna. He was too slow and clumsy with words his comforting hand would only break the old man's back. Old Malone had given six sons to space, Johnny was the last from Saturn to the sun, his blood was strewn for nothing. unable to find the murderer. A single Venusian should have been easy to Bo returned to the transient quarters and dialed Valeria McKittrick. "what's the matter? I thought we were blasting today." "Hadn't you heard?" asked Bo. He found it hard to believe she could be ignorant, here where everybody's life was known to everybody else. "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 Bo shrugged, not caring much. "I'll circulate an ad if you want, but—" another. He placed his ad on the radinews circuit and then went out to get drunk. It was all he could do for Johnny now, drink him a final wassail. Already his friend was cold under the stars. In the course of the evening he found himself weeping. Bo felt his mouth gape open. "Huh? I never thought—" Drake had come to Achilles to pick up for sabotage? The event had taken place about a month ago, when the Bo had heard of it in the course of "I thought she went back anyway," he said. Bo understood that kind of loyalty. You couldn't travel space without 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 Bo relaxed against the thrust, thinking of Achilles falling away behind them. "So long," he whispered. "So long, Johnny." III and a couple of minutes later he would be dead. Bo clamped his teeth together, as if he would grip consciousness in dead already? Redness flamed before his eyes, red like Valeria's hair blowing across the stars. It was sheer reflex which brought his arm around to slap the straining to break loose and kill him. Bo's mind wavered back toward life. He opened the valves wide on his to lie on naked rock while the enemy hunted him. Bo shuddered and the inside, scratched his ribs, and fallen dead. Next time he probably He wanted terribly to sleep.

<question>:
Why was the murderer trying to kill Bo?

<options>:
A We never find out
B He was a rival of the Sirius Transportation Company
C He was in love with Valeria
D To get revenge for Johnny's death

<answer>:

A