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 Duane's hand flicked to his waist and hung there, poised. His dis-gun The muscles twitched in Peter Duane's cheeks, but his voice, when it He said, "Duane, Andrias is your boss, not mine. I'm a free lance my fair share of the proceeds. That's as far as it goes. I take no orders from him." A heavy-set man in blue appeared at the end of the connecting corridor. He was moving fast, but stopped short when he saw the two men. "Hey!" he said. "Change of course—get to your cabins." He seemed about 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. A muted alarm bell sounded through the P.A. speakers, signaling a one-minute warning. The white-haired man cocked his eyebrow. "Not at all," he said. He took the measure of his slim, red-headed belligerent than Duane, standing there. "Not at all," he repeated. Duane stared at him a long second, then nodded abruptly. "I was right 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. " Now will you listen to reason?" Duane panted. But he halted, and the gravity. The two men, locked together, floated weightlessly out to the center of the corridor. "Course change!" gasped white-haired Stevens. "Good God!" The ship had reached the midpoint of its flight. The bells had sounded, warning every soul on it to take shelter, to strap themselves in their pressure bunks against the deadly stress of acceleration as the ship reversed itself and began to slow its headlong plunge into Callisto. But the two men had not heeded. opposite wall, still weightless, still clinging to each other, still struggling. Then the main-drive bellowed into life again, and the ship began to battle against its own built-up acceleration. The corridor floor rose up with blinking speed to smite them— And the lights went out in a burst of crashing pain for Peter Duane. Someone was talking to him. Duane tried to force an eye open to see who It was a girl's voice. Duane was suddenly conscious that a girl's light stimulant, to help you throw off the shock of your—accident. You're all right, otherwise." 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, The dark man laughed. "Take your time, Duane," he said easily. "You'll The nurse, still eyeing Duane with an odd bewilderment, said: "I'll "You play rough, Duane," he observed. "I thought you'd have trouble Duane waved a hand and pushed himself dizzily erect, swinging his legs Andrias straightened, turned a darkly-suspicious look on Duane. "Don't "Go to hell," Duane said shortly. "I'm playing no tricks." 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 Andrias for instructions. "Duane here is resisting arrest," Andrias said. "Take him along. We'll blasting off for Ganymede within two hours. I'll wait—but so will the ship. It's not going anywhere till I give it clearance. I run Callisto I'll give the orders here!" II Duane off without a word. Duane had thought the nurse, who seemed a good enough sort, might have said something on his behalf. But she was out of sight as they left. A curt sentence to a gray-clad official on while the two uniformed men shoved Duane into the back of the car, forward. The driver, sitting beside Andrias, leaned forward and readied a hand under the dashboard. The high wail of a siren came instantly from the car's roof, and what traffic was on the broad, straight highway into which they had turned pulled aside to let them race through. they seemed dreamlike yet somehow oddly familiar to Duane. Somewhere My name, it seems, is Peter Duane 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. But the chance was a long time in coming. Duane found himself, an hour and frescoed walls. Duane wished for human companionship—particularly Duane sat down on a lumpy, sagging bed and buried his head in his Duane could remember the scene clearly. Could almost see the sharp, unfrequented side streets to a great windowless building. Duane Duane got up, stared at his haggard face in the cracked mirror over "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 The trick failed to work. Duane had other things on his mind "Here I am," said Duane. "What do you want?" handed it to Duane. "In spite of your behavior, you can keep alive. —the ship you came on. Sign it, and we'll forget our argument. Only, sign it now and get it over with. I'm losing patience, Duane." 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' But Andrias, unconscious already, tumbled back with Duane on top of Duane got up, retrieving the two heat guns, and stared at him. I'm getting in a rut! " 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 An idea bloomed in Duane's brain. He looked, then, at unconscious Duane's fingers Duane's head, butting Andrias in the face, had drawn a Duane touched the heat gun he'd thrust into his belt sign. Only—the first tremors of movement that had shown on him halted, and did not reappear. " ," Duane thought. " would be getting impatient. Perhaps any minute he would tap the door, first timorously, then with heavier strokes. Duane eyed the length of the room. Thirty feet—it would take him a But Duane's arm was around his throat, and he had no breath to spare. 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 long bell cord without causing it to ring and, bearing it, he dropped conceal that, perhaps. In any case, there was nothing better. Trying to make his stride as martial as possible, he walked down the

<question>:
Why did Duane ring the bell?

<options>:
A To call a guard because he was done signing
B To begin his escape plan
C To call help for Andrias
D To signal the course change

<answer>:

B