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

<passage>:
"Nothing around those other suns but ashes and dried blood," old Dunbar told the space-wrecked, desperate men. But Dunbar's eyes were old and uncertain. How could they believe in his choice when every star in this forsaken There was just blackness, frosty glimmering terrible blackness, going 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 where they were, or where they were going. Suddenly, Old Dunbar had known where they were. Suddenly, Dunbar knew where they were going. wherever he was going. Four men, thought Russell, held together by an invisible string of gravity, plunging through a lost pocket of hell's dark where there had never been any sound or life, with old Dunbar the first in line, taking the lead because he was older and knew where he was and where 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. How long ago that had been, Russell didn't know. All Russell knew was recognizable pattern. But Dunbar knew. And Russell was looking at 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 thought then of what Dunbar would say to such a thought, how Dunbar Dunbar had a big answer for every little thing. When the four of them had escaped from that prison colony on a sizzling hot asteroid rock in the Ronlwhyn system, that wasn't enough had ever heard of, where they could live like gods on a green soft world like the Earth had been a long time back. And Dunbar had spouted endlessly about a world of treasure they would find, if they would just follow old Dunbar. That's what all four of them had been trying to find all their lives in the big cold grabbag of eternity—a rich star, a rich far fertile star where no one else had ever been, loaded with treasure that had no name, that no one had 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 was sure his hunch was right. "That's right, boys!" yelled old Dunbar in that sickeningly optimistic "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 Alvar and Johnson would see that he was cracked. "Yeah," said Alvar. "You still say that, Dunbar?" Old Dunbar laughed. The sound brought blood hotly to Russell's face. 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 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 said. "Dunbar—how long'll it take us?" "What?" croaked Alvar. 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 all be crazier than you are—" "We'll make it, boys. Trust ole' Dunbar. What's a year when we know "Now quiet down, Russ," Dunbar said in a kind of dreadful crooning "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 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'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. "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 ... "Maybe he was wrong, crazy, full of lies," Alvar said. "But now he's dead." "How could he see any difference in those four stars?" Russell said, louder. "He thought he was right," Alvar said. "He wanted to take us to paradise. He was happy, nothing could stop the old man—but he's dead now." ," said Alvar. It was quiet. How could it be so quiet, Russell went on ahead, leading the other three at the front of the gravity-rope. "Maybe he was wrong," Alvar said. "But now do we know which way is right?" decide what to do." And Alvar said, "Guess he was crazy all right, and I guess we trusted 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?" "I always had a feeling we were going wrong," Johnson said. "Anyway, because he was alone. He'd have broken away, gone his own direction, long ago but for that fear. "How can we tell which of us is right?" Alvar said. "It's like everything was changing all the time out here. Sometimes I'd swear Johnson started to laugh. Russell was yelling wildly at them, and old Dunbar? Even less than to us, I guess. He's dead and he won't Russell felt the release, felt the sudden inexplicable isolation and aloneness even before Alvar and Johnson used their life-guns and shot dwindling and dwindling and blinking out like little lights. Fading, he could hear their voices. "Each to his own star," Johnson Russell used his own life-gun and in a little while he didn't hear Alvar or Johnson's voices, nor could he see them. They were thousands 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. 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 such an age was usually lucky. Or at least that is what they say about the lost sectors." "Maybe he knew the way here. Maybe he was here before—sometime." they did, it was well over a thousand years ago." Another said. "He has a fine face, this old man. A noble face. Whoever he is ... wherever he came from, he died bravely and he knew the way, to his stature, and he will rest here among the brave. "Let the women dance and the music play for this old man. Let the

<question>:
Which isn't a reason why Russell didn't tell Johnson and Alvar directly that he thought Dunbar was crazy?

<options>:
A All of their communication systems are connected
B He had already given up on life
C He might have been secretly curious about the stories
D He wanted them to find out for themselves

<answer>:

D