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

<passage>:
But Dunbar's eyes were old and uncertain. How could they out and out forever in all directions. Russell didn't think they could remain sane in all this blackness much longer. Bitterly he thought of how they would die—not knowing within maybe thousands of light years Dunbar, the oldest of the four, an old space-buster with a face Suddenly, Old Dunbar had known where they were. Suddenly, Dunbar knew if only a man's brain would hold up, Russell thought. The suits were he was going. Maybe Johnson, second in line, and Alvar who was third, knew too, but were afraid to admit it. But Russell knew it and he'd admitted it from the first—that old Dunbar was as crazy as a Jovian juke-bird. A lot of time had rushed past into darkness. Russell had no idea now How long ago that had been, Russell didn't know. All Russell knew was recognizable pattern. But Dunbar knew. And Russell was looking at Dunbar's suit up ahead, watching it more and more intently, thinking about how Dunbar looked inside that suit—and hating Dunbar more and more for claiming he knew when he didn't, for his drooling optimism—because he was taking them on into deeper darkness and calling their destination Paradise. Russell wanted to laugh, but the last time he'd given way to this impulse, the results inside his helmet had been too unpleasant to repeat. Sometimes Russell thought of other things besides his growing hatred of the old man. Sometimes he thought about the ship, lost back there thought then of what Dunbar would say to such a thought, how Dunbar Dunbar had a big answer for every little thing. We all look alike out here in these big rocket pressure suits, Russell away could see or care. Still—we might have a chance to live, even now, Russell thought—if it weren't for old crazy Dunbar. They might have a chance if Alvar and Johnson weren't so damn lacking in self-confidence as to put all their trust in that crazed old rum-dum. Russell had known now for some time that they were going in the wrong direction. No reason for knowing. Just a hunch. And Russell "That's right, boys!" yelled old Dunbar in that sickeningly optimistic life on it, Dunbar ... the only one we can live on?" Russell asked. "That's right! That's right," Dunbar yelled. "That's the only one—and Dunbar?" Russell asked. Keep the old duck talking like this and maybe "Yeah," said Alvar. "You still say that, Dunbar?" "No life, boys, nothing," Dunbar laughed. "Nothing on these other said that one had a red rim, Dunbar, and I wanted to believe it. So Old Dunbar laughed. The sound brought blood hotly to Russell's face. Russell was very sick of the old man's voice. He was at least glad he didn't have to look at the old man now. His bald head, his skinny bobbing neck, his simpering watery blue eyes. But he still had to suffer that immutable babbling, that idiotic cheerfulness ... and knowing all the time the old man was crazy, that he was leading them wrong. I'd break away, go it alone to the right sun, Russell thought—but I'd never make it alone. A little while out here alone and I'd be nuttier than old Dunbar will ever be, even if he keeps on getting nuttier all the time. Somewhere, sometime then ... Russell got the idea that the only way was to get rid of Dunbar. Russell suddenly shouted. "Keep quiet, Dunbar. Shut up will you?" Johnson didn't say anything at all. Russell screamed at Dunbar, then quieted down. He whispered. "Six crazy as hell, Dunbar. Crazy ... crazy! Nobody could stand it. We'll "Now quiet down, Russ," Dunbar said in a kind of dreadful crooning trapped like this liable to start meandering. Liable to start losing the old will-power." He chuckled. "Shut up!" Johnson yelled. Dunbar laughed. "Boys, boys, don't get panicky. Keep your heads. Just stick to old Dunbar and he'll see you through. I'm always lucky. Only rims. He yelled this fact out to the others. And Alvar said. "Russ's on our hungry hides. That's worth waiting for." Russell did it before he hardly realized he was killing the old man. It was something he had had to do for a long time and that made it Dunbar. If he'd aimed right, Russell knew the fire-bullet should have pierced Dunbar's back. Now the fire was gone, extinguished of the gravity rope, Dunbar was dead. Dunbar's last faint cry from inside his suit still rang in Russell's Johnson both called Dunbar's name a few times. There was no answer. "Russ—you shouldn't have done that," Johnson whispered. "You "No," Alvar said, so low he could barely be heard. "You shouldn't have done it." "I did it for the three of us," Russell said. "It was either him or us. Lies ... lies that was all he had left in his crazy head. Paradise ... don't tell me you guys don't see the red rims around all four suns, all "How could he see any difference in those four stars?" Russell said, louder. him because we didn't have the strength to make up our own minds. Why does a crazy man's laugh sound so good when you're desperate and don't know what to do?" Russell said, "I've had a hunch all along that maybe the old man was Sweat ran down Russell's face. His voice trembled. "No—that's wrong. You're both wrong." He could see himself going it alone. Going crazy because he was alone. He'd have broken away, gone his own direction, long ago but for that fear. "We got to stay together," said Russell. "Nobody could spend a year out here ... alone...." "Ah ... in another month or so we'd be lousy company anyway," Alvar said. "Maybe a guy could get to the point where he'd sleep most of the time ... just wake up enough times to give himself another boost with believe there is one we can live by, because we all seem to agree that the old man might have been right about that. If we stick together, the chance is three to one against us. But if each of us makes for one star, one of us has a chance to live. Maybe not in paradise like the can come and help the other two...." "No ... God no...." Russell whispered over and over. "None of us can ever make it alone...." Johnson started to laugh. Russell was yelling wildly at them, and Now Russell wasn't saying anything. old Dunbar? Even less than to us, I guess. He's dead and he won't Russell couldn't say anything. He stared at the endless void which now he would share with no one. Not even crazy old Dunbar. Russell felt the release, felt the sudden inexplicable isolation and aloneness even before Alvar and Johnson used their life-guns and shot out of sight, Johnson toward the left and Alvar back toward that other red-rimmed sun behind them. Russell used his own life-gun and in a little while he didn't hear Russell's head fell forward against the front of his helmet, and he closed his eyes. "Maybe," he thought, "I shouldn't have killed the old man. Maybe one sun's as good as another...." Then he raised his body and looked out into the year of blackness that waited for him, stretching away to the red-rimmed sun. Even if he were right—he was sure now he'd never make it alone. pierced his body. Here. You see?" "Yes," another of them said. "But what amazes me is that this old man picked this planet out of all the others. The only one in this entire sector that would sustain life." "Maybe he was just a very lucky old man. Yes ... a man who attains

<question>:
Which effect of Russell's decision to kill Dunbar was likely most surprising to Russell?

<options>:
A The fact that nobody agreed on which sun was the correct one
B The decrease in chatter in the communication system
C The way the Dunbar died without much drama
D He sabotaged himself by ensuring his loneliness

<answer>:

D