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

<passage>:
DUST UNTO DUST By LYMAN D. HINCKLEY cautious advance of three awed space-scouters. An hour later they surfaced about two hundred yards away from the Planet Stories Summer 1955. Extensive research did not uncover any evidence that usually exercises in a situation where the totally unexpected has The men from the ship knew only the surface facts about this waiting and the previous ten, in the time allowed them for exploration while this planet was still close enough to their own to permit a safe return in their ships, had not spotted the city. But the eleventh expedition flight could be safely started. So far as was known, this was the only city on the planet—the planet without any life at all, save tiny Wass murmured, "Let us hope they aren't immortal." Martin stood up. "Let's try farther on. Rodney, radio the ship, tell "Defense," Rodney, several yards behind, suggested. them, people? Have you noticed how low everything is?" Rodney's laughter rose, too. Then, sobering—"Maybe they crawled." A nebulous image, product of childhood's vivid imagination, moved Then—"I wonder what it's like here in the winter when there's no light "If we don't hurry up and get through this place and back to the ship, we're very likely to find out." He straightened his shoulders. The city was alien, of course, and that explained most of it ... most of it. But he felt the black city was something familiar, yet twisted and distorted. The blond man grinned ruefully. "I left the camera in the lifeboat." There was a pause. Then Wass, defensively—"It's almost as if the city almost as if ... they were human up to a certain point, the point being, perhaps, some part of their minds.... Alien things, dark and subtle, things no man could ever comprehend. Parallel evolution on two inner planets of the same system? Somewhere, decided to grin at himself, at his own imagination. "Martin, I can't get out!" it's like a "We're trapped, we're trapped, they are—" be all around us." He was silent for a time, exploring the consequences He shook his head angrily, saying, "Judging by reports of the rest of "Why not?" "I wonder where it gets its power?" may have to...." rope of cables which ran upward to vanish unexpectedly in the metal "Is this it," Wass murmured, "or an auxiliary?" "Another assumption," Wass said. "We have done nothing but make "What would you suggest, instead?" Martin asked calmly. "The ship leaves in eleven hours." "We have to find out what all this stuff's for!" "Going at it blindly, we'd probably execute ourselves." "We've got to—" "No!" Then, more quietly—"We still have eleven hours to find a way time it takes us to get to the lifeboat, fly to the ship, land, stow it, get ourselves aboard, and get the big ship away from the planet. thinking of your own tender hide, of course." Rodney cursed. "And every second we stand here doing nothing gives us that much less time to find a way out. Martin—" "Well...." Rodney turned quickly toward the black arch. "Let's get out Rodney said, "To search every building next to the dome clean around "Have you a better idea?" the dome, does it project down into the ground as well?" "You mean "Sure. Why not?" "We're wearing heavy suits and bulky breathing units. We have no equipment." to themselves." a circle. "No supports. No supports anywhere. What keeps all that up his light. "Does all this, this whole place, look at all familiar to "Yes," Wass said dryly, "it does. I'm sure this is where all my nightmares stay when they're not on shift." silently. They moved along the metal, past unfamiliar shapes made more so by gloom and moving shadows, past doors dancing grotesquely in the "We go back, I guess," Martin said. "Unless someone has a better idea," Martin conceded. He waited. But the same dancing shapes of metal, the partitions, the odd windows, all then when they were walking toward it. The dream was gone again for some point twisted away from their evolutionary spiral, plagued by a a faint strain through all this broad jumble, the junkpile of alien a bank of glass cases which stretched off into the distance as far as the combined light of their torches would reach. "Seeds!" Wass exclaimed, his faceplate pressed against the glass. Martin blinked. He thought how little time they had. He wet his lips. Wass' gloved hands fumbled awkwardly at a catch in the nearest section wouldn't grow there.... Or had they, once? "Don't, Wass!" Torchlight reflected from Wass' faceplate as he turned his head. "Why They were like children.... "We don't know, released, what they'll do." "Skipper," Wass said carefully, "if we don't get out of this place by the deadline we may be eating these." Martin raised his arm tensely. "Opening a seed bank doesn't help us find a way out of here." He started up the ramp. "Besides, we've no gun. His mind, too, was taken up with childhood's imaginings. "For a plant to grow in this environment, it wouldn't need much water. Maybe—" he had a vision of evil plants attacking them, growing with super-swiftness at the air valves and joints of their suits "—only the little moisture in the atmosphere." take off. Let's search awhile first. Let this be a last resort." Postpone and postpone until it's too late, and the ship leaves without us and we're stranded here to eat seeds and gradually dehydrate ourselves and God only knows what else and—" He reached out convulsively and yanked a switch. a last resort it might be better to be blown sky high than to die resort. We still have a little time." Rodney said, "How does water help us get out?" looking back. "It got in and out of the city some way. Perhaps we can leave the same way." They walked down the ramp and stood together, silent in a dim pool of before the war as a retreat." He turned impatiently. "How should I "In a minute," Martin said, too irritably, "we'll have a sentient planet." From the corner of his eye he saw Rodney start at that. "Knock it off, Wass. We're looking for reservoirs, you know." "We'll disperse and search carefully," Martin said. "I wonder what the pattern was." "... The reservoirs, Wass. The pattern will still be here for later expeditions to study. So will we if we don't find a way to get out." I've found something!" Suddenly, without a sound, the disk rose, like a hatch, on a concealed hinge. The three men, clad in their suits and helmets, grouped around the six-foot opening, shining their torches down into the thing that drifted and eddied directly beneath them. "Martin! It's all alive! It's moving!" Then—"It wasn't.... Why did you close the hatch then?" tenuous, questing alien limb edged through the hatch, curling about Martin, sparkling in ten thousand separate particles in the torchlight, obscuring the dimly seen backdrop of geometrical processions of strange of the hatch to stare coldly at Wass. "You'd rather monkey with the switches and blow yourself to smithereens?" disgustedly, and then began to descend the rope, slowly, peering into as we avoid the drifts." and swirled about them until the purifying systems in their suits were hard-pressed to remove the fine stuff working in at joints and valves. Then Wass broke his silence, taunting. "The ship leaves in two hours, Rodney stared. "Wass!" he shouted. "We've found a way out!"

<question>:
What does the crew find that somehow makes them all start to think of ways to escape?

<options>:
A a book from their home planet.
B The switchboard.
C instructions from those before them.
D seedpods.

<answer>:

B