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

<passage>:
when Zarwell arrived that evening. HE was lying motionless on a was it himself? in some corner of his consciousness, kill him right away,” a second, less confident voice said. “It’s supposed negligently against a stone pillar, to his right but within vision, straightened and barked an order “Execute him, I suppose,” the harsh voice said matter-of-factly. see what he looks like first. They’ll be disappointed.” Zarwell opened his eyes a slit to observe his surroundings. It was a mistake. “He’s out of it,” the first speaker said, and Zarwell allowed his eyes to open fully. the big man who had bruised him Irrelevantly he wondered how he knew now that it had been a spaceport. His captor’s broad face jeered down at Zarwell. “Have a good sleep?” he asked with mock solicitude. Zarwell did not deign to acknowledge that he heard. The big man turned. “You can tell the Chief he’s awake,” he said. Zarwell followed his gaze to where a younger man, with a blond lock of hair on his forehead, stood behind him. The youth nodded and went out, while the other pulled a chair up to the side of Zarwell’s cot. While their attention was away from him Zarwell had unobtrusively There was nothing to do after face splitting in a grin that revealed able to incapacitate two or three and break out. But the fact that Zarwell told him. The grin faded from the oily face as the man stood up. He leaned over the cot—and Zarwell’s left hand shot up and locked about his throat, joined almost immediately by the right. He offered no resistance as they ruffian, copper-brown face damp with perspiration and body oil, grabbed him by the jacket and that failed to break the grip he suddenly reversed his weight and drove his fist at Zarwell’s head. Zarwell pulled the struggling body down against his chest and and a hard flat object crashed against the side of his skull. The starch went out of his legs. held it there until all agitated “D movement ceased. He sat up then, letting the body slide to the floor. John Zarwell shook his head. “Did I talk while I was under?” nonchalance. “The next couple should do it.” Zarwell did not answer. His memory seemed on the point of complete return, and he sat quietly, “I don’t see why not.” Zarwell Zarwell corrected him. “You’d be foolish!” how close he was to death. Yet surprisingly, after the first start, he showed little fear. Zarwell had thought the man a bit soft, too adjusted to a life of ease and some Curiosity restrained his trigger finger. the drug. “A scopolamine derivative that’s been well tested.” The floor beneath Zarwell’s feet assumed abruptly the near transfluent consistency of a damp chatter as he administered Zarwell debated with himself the truth of what the other had said. trouble.” The floor continued its transmutation, and Zarwell sank deep into viscous depths. “Lie back and relax. Don’t …” The words tumbled down from above. They faded, were gone. ZARWELL found himself standing on a vast plain. There was “Why didn’t you turn me in?” he Zarwell’s eyebrows raised. forehead creased with his mental 145 ] Zarwell made his decision quickly. ALL Zarwell’s attention seemed on the cigar he lit as he rode face was unharmed, yet it was no longer the same. No longer his own was under his arm a minute later. one eye twitched spasmodically. One cheek wore a frozen quarter “No,” Zarwell answered. smile. Thirty-six hours under the paralysis was longer than advisable. least every twenty hours. Fortunately his natural features would serve as an adequate disguise himself well in an emergency. glance in the mirror satisfied him with the changes that had been down at his appointment pad. “Tomorrow at two, then?” Zarwell grunted acknowledgment and pushed himself to his feet, apparently unaware that his Removing his fiber-cloth jacket he slashed it into strips with the Zarwell left the analyst’s office. The white marble of the city’s buildings shimmered in the afternoon razor blade and flushed it down the gray-mottled with windows. Zarwell was careful not to rest his hand on the flesh searing surface of the stone. waking from a vivid dream. had your mind already preconditioned you deliberately give yourself amnesia?” Zarwell passed a group of smaller children playing a desultory game of lic-lic for pieces of ] “Trust and money,” Zarwell said drily. “Your memory’s back then?” Zarwell nodded. his ennui. 139 ] The next morning when Zarwell awoke he lay for a moment, unmoving. Zarwell stopped him with an upraised The feeling was there hand. “Good God, man, can’t you see the reason for all this? I’m Zarwell explained listlessly. “A If he rested quietly it would all come to him. Yet always, when his mind lost its sleep-induced [p 140 again, like a scene waiting only to lethargy, the moment of near understanding of disorientation did not pass with full wakefulness. He achieved no Zarwell’s tone appealed The feeling was still with him when he returned to the psychoanalyst. A village was being ravaged. Men struggled and died in the streets. Zarwell moved among them, seldom taking part in the The background changed. He left. RESTLESSNESS drove Zarwell was nearing its end. Zarwell was from his flat the next day—a riding a shaggy pony outside a high wall surrounding the stricken metropolis. Here a city burned. Its resistance legal holiday on St. Martin’s. At Zarwell turned and studied the killing. Zarwell was not the leader of the in the streets again, plundering and man without answering. He was invaders, only a lesser figure in the medium tall, with the body of an The job had been well done. Time passed, without visible break in the panorama. Now Zarwell was fleeing, pursued by the Zarwell tried to feel the anger he The man nodded. same bearded men who had been wanted to feel, but somehow it for the eventuality that had befallen. He made his escape without resourceful, and well prepared Against his will he found himself conflict engulfed him. Weary but resigned he accepted 141 ] Zarwell smiled with mild embarrassment. “At least in my dreams.” experienced under the drug were not dreams. They were recollections Zarwell found himself not listening Zarwell’s expression became as Johnson’s voice went on. The past.” story was always the same. But why they had been expecting him meant of his chair. “I remember nothing new thought. Just why had he recall episodes are always purely trigger a complete memory return. Johnson had finished his speech. Zarwell gazed up at the bright memory will turn out to be no ordinary sky. He pulled in a long breath, that your mind has been tampered amnesia. I believe we will find with.” and let it out in a sigh. drug fits into the past I do remember.” “You don’t remember what we reached him. then, what you think you remember “I won’t have any time off again until next week end,” Zarwell reminded him. more than casually interested in your case by this time.” A WORK truck picked Zarwell up the next morning and he rode with a tech crew to the edge of to keep his footing someone drove a fist into his face. He started to to fit the world for human needs. When Zarwell arrived, six months before, the vitalized area export thus far. Zarwell pulled his sun helmet lower, to better guard his hot, dry features. The wind blew continuously After its three-thousand-mile journey across scorched sterile rock, it Zarwell gazed idly about at the

<question>:
How did Zarwell lose his memories?

<options>:
A A soldier hit Zarwell in the head with the butt of a gun, leaving him with amnesia.
B Zarwell was knocked unconscious when a building collapsed around him. He awoke with amnesia.
C Zarwell had his memories removed so he could get out of the revolution business.
D A bullet grazed Zarwell's head during the last revolution, leaving him with amnesia.

<answer>:

C