question:  Which of these was not an impact of Russell's decision to kill Dunbar?
context: Russell didn't think they could remain sane in all this blackness much longer. Dunbar, the oldest of the four, an old space-buster with a face wrinkled like a dried prune, burned by cosmic rays and the suns of worlds so far away they were scarcely credible, had taken command. 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. But Russell knew it and he'd admitted it from the first—that old Dunbar was as crazy as a Jovian juke-bird. Russell had no idea now how long the four of them had been plunging toward the red-rimmed sun that never seemed to get any nearer. 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. And a human was smaller still, thought Russell when he was not hating Dunbar. 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 for Dunbar. no—Dunbar had to start talking about a place they could go where they'd never be apprehended, in a system no one else had ever heard of, where they could live like gods on a green soft world like the Earth had been a long time back. that's the only one with life on it, Dunbar ... the only one we can live on?" "No life, boys, nothing," Dunbar laughed. You said that one had a red rim, Dunbar, and I wanted to believe it. The second planet from that red-rimmed sun.
output:  He was able to pick the path to the correct sun
options:  Russell would have to travel alone  He was able to pick the path to the correct sun  It became quieter in general  Arguments increased amongst the team