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

<passage>:
By POUL ANDERSON Behind a pale Venusian mask lay hidden the arch-humanist, the anti-tech killer ... one of 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. [Transcriber's Note: This etext was produced from whirling speck of stone and waited for the man who was coming to kill him. There was no sound except the thudding of his own heart, the harsh rasp of his own breath, locked inside the stinking metal skin of his suit. Otherwise ... no air, no heat, no water or life or work of man, only a granite nakedness spinning through space out beyond Mars. Stooping, awkward in the clumsy armor, he put the transparent plastic 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. was gone into night. 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. October. Suit, equipment, and his own body, all together, weighed only 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 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 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. "r" in the official one even for that planetoid, it is a rowdy bar where Guardsmen come in trios. But Johnny Malone liked it, and talked Bo Jonsson into going there for a final spree before checkoff and departure. "Nothing to compare," he insisted. "Every place else is 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 one of Achilles' three live ecdysiasts with hungry eyes, and by some 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!" and a wench is what I need. Most especially the wench, because I don't Dog ." "Because I am one at heart. Look, Bo, why don't you get over that 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 himself and Johnny (c) a warehouse, berth, and three other part owners back in Luna City. Not exactly a tramp ship, because you can't normally stop in the middle of an interplanetary voyage and head for somewhere 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—" that diaper of yours?" 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. The Venusian was already on the move. He sprang straight up, slammed a kick at the wall, and arced out the door into the dome corridor beyond. 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 girl screamed. A man cursed and tried to follow the Venusian. He tangled with another. "Get outta my way!" A roar lifted, someone next face of the rough cube which was the asteroid. Bo lay on his belly The Great Bear slid into sight, down under the world as it turned. He but even then he wanted the helpless and soon frozen body would be just another meteor for the next Bo stood unmoving an instant, fighting the impulse to leap away. He was 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 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. 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 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. 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. "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 Luna with you." "Your ticket will be refunded, of course," said Bo heavily. "But you aren't certified, and the 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 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 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 but I understood—" "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 had come to Achilles to pick up a cargo of refined thorium for Earth while she lay in orbit, she had gasket. Why the accident should have occurred, nobody knew ... spacemen while we got it would have carried Earth and Achilles past optimum Bo understood that kind of loyalty. You couldn't travel space without myself." "Notice a year's gap here," said Bo, pointing to the service record. "On Venus." "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 was loaded, inspected, and cleared. A "scooter" brought her three passengers up to her orbit, they embarked, settled down, and and a couple of minutes later he would be dead. straining to break loose and kill him. Born, spewed out of an iron womb into a hollowness of stars and cold, the inside, scratched his ribs, and fallen dead. Next time he probably an asteroid.

<question>:
What was the dog?

<options>:
A Dr. McKittrick's pet
B A tramp ship
C A transport ship
D A Venusian pet

<answer>:

C