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

<passage>:
Revolt was flaring on Callisto, and Peter Duane held the secret that would make the uprising a success or failure. Yet he could make no move, could favor no side—his memory was gone—he didn't know for whom he fought. Duane's hand flicked to his waist and hung there, poised. His dis-gun "You're right, Duane," he said. "I could blast you, too. Nobody would win that way, so let's leave the guns where they are." The muscles twitched in Peter Duane's cheeks, but his voice, when it cut me out!" The white-haired man's smile faded. He stepped forward, one hand He said, "Duane, Andrias is your boss, not mine. I'm a free lance to walk up to them, then reconsidered and hurried off. Neither man paid any attention. Duane said, "Do I have to kill you?" It was only a question as he asked it, without threatening. belligerent than Duane, standing there. "Not at all," he repeated. Leave Andrias out of our private argument." Duane stared at him a long second, then nodded abruptly. "I was right the first time," he said. "I'll have to kill you!" Already his hand was streaking toward the grip of his dis-gun, touching it, drawing it forth. But the white-haired man was faster. His arms swept up and pinioned Duane, holding him impotent. "Don't be a fool," he grated. "Duane—" heard it. Duane lunged forward into the taller man's grip, sliding down He was too late. Duane's was out and leveled at him. will you listen to reason?" Duane panted. But he halted, and the Someone was talking to him. Duane tried to force an eye open to see who Duane screwed his eyes tight together and grimaced. When he opened Duane shook his head confusedly. "I don't know anything," he said. "Duane, Duane," a man's heavy voice said. "That won't wash. Don't play "Duane?" he said. "Duane...." He swiveled his head and saw a dark, "You play rough, Duane," he observed. "I thought you'd have trouble Andrias straightened, turned a darkly-suspicious look on Duane. "Don't "Go to hell," Duane said shortly. "I'm playing no tricks." There was an instant's doubt in Andrias' eyes, then it flashed away. He bent closer, peered at Duane. "I almost think—" he began. That's your last chance that just went by, Duane. From now on, I'm "Duane here is resisting arrest," Andrias said. "Take him along. We'll "You can't do that," Duane said wearily. "I'm sick. If you've got Whoever this man Andrias was, thought Duane, he was certainly a man of Duane off without a word. Duane had thought the nurse, who seemed a while the two uniformed men shoved Duane into the back of the car, he had seen them before. He dragged deep into his mind, plumbing the cloudy, impenetrable haze that had settled on it, trying to bring forth the memories that he should have had. Amnesia, they called it complete My name, it seems, is Peter Duane , he thought. And they tell me that I killed a man! The thought was starkly incredible to him. A white-haired man, it had been supplied to Duane. There has even been talk of killing.... But—murder! Duane looked at his hands helplessly. Andrias, up ahead, was turning around. He looked sharply at Duane, for "Who's this man Andrias?" Duane whispered to the nearest guard. had brought him there, at Andrias' order, and left him. That had been and frescoed walls. Duane wished for human companionship—particularly deadly. It was too bad, Duane reflected, that he'd failed to remember her. She'd seemed hurt, and she had certainly known him by first name. But perhaps she would understand. Duane sat down on a lumpy, sagging bed and buried his head in his Andrias is secretly arming the Callistan cutthroats for revolt against the League. He wants personal power—he's prepared to pay any price for it. He needs guns, Duane could remember the scene clearly. Could almost see the sharp, stopped. A fugitive recollection raced through his mind. He halted it, dragged it back, pinned it down.... Duane got up, stared at his haggard face in the cracked mirror over the bed. " They say I'm a killer ," he thought. " Apparently I'm a gun-runner as well. Good lord—what am I not? " His reflection—white, drawn face made all the more pallid by the red hair that blazed over it—stared back at him. There was no answer "All right, Duane." The deep voice of a guard came to him as the door Duane looked around. The guard beckoned. "Governor Andrias wants to a great heavy desk—that was Andrias' office. Duane felt a click in his The trick failed to work. Duane had other things on his mind The guard had remained just inside the door, at attention. Andrias handed it to Duane. "In spite of your behavior, you can keep alive. Duane said, without expression, "No." "I'll have your neck for this, Duane," he said softly. Duane looked at the man's eyes. Death was behind them, peeping out. handed the paper to Duane without a word. He gave him a pen, watched Andrias' eyes widened. "You amaze me, Duane," he said. He rose and stepped around the desk, confronting Duane. "I almost think you really have lost your memory, Duane," he said. "Otherwise, surely you would Duane said, "You're ready, then...." Duane saw his danger, and reacted. His foot twisted around Andrias' ankle his hands at the other's throat gripped tighter. He lunged But Andrias, unconscious already, tumbled back with Duane on top of Duane got up, retrieving the two heat guns, and stared at him. " They tell me I killed Stevens the same way ," he thought. " I'm But Andrias was not dead, though he was out as cold as the void beyond Duane stepped over the unconscious man and looked around the room. It Duane took the release he had signed and tore it to shreds. But that was only a gesture. When Andrias came to, unless Duane had managed to When Andrias came to.... An idea bloomed in Duane's brain. He looked, then, at unconscious Andrias—and the idea withered again. He had thought of forcing Andrias himself to front for him, at gun's who lose them. Andrias' throat was speckled with the livid marks of Duane's fingers Duane's head, butting Andrias in the face, had drawn a drew it and held it poised, while he sought to discover what was in his own mind. He'd killed a man already, they said. Was he then a killer—could he shoot Andrias now, in cold blood, with so much to gain and nothing to lose? He stood there a moment. Then, abruptly, he reversed the weapon and chopped it down on Andrias' skull. No ," Duane thought. " Whatever they say, I'm not a killer! " But still he had to get out. How? would be getting impatient. Perhaps any minute he would tap the door, first timorously, then with heavier strokes. Duane's foot lashed out and the door slammed shut Duane's balled left Duane took a deep breath and let the man drop to the floor. But he struggle as he would. The guard he stripped of clothing, bound and gagged with his own then, the fact of Andrias' unconsciousness might not be noticed.

<question>:
Why did Duane not kill Andrias?

<options>:
A He tried to kill him but failed
B He did not have the opportunity to kill him
C He did kill him
D He did not want to be a killer

<answer>:

D