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

<passage>:
Martin set the lifeboat down carefully, with all the attention one He frowned. The first impression was ... malignant. Wass, blond and slight, with enough nose for three or four men, unbuckled his safety belt and stood up. "Shall we, gentlemen?" and with Martin led Wass, and the gangling, scarecrow-like Rodney, through the Wass watched him, and then shoved aside more sand, several feet away. is—was—for." Wass looked at him shrewdly. "Neither were the—well, shall we call 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 "If we don't hurry up and get through this place and back to the ship, we're very likely to find out." Rodney said quickly, "I mean outside." What's the matter, Wass?" 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 didn't want to be photographed." other's shoulder cruelly. "You couldn't have. Get hold of yourself, man!" "Martin, I can't get out!" Rodney mumbled something, and Martin told him to shut up. it's like a glass wall." "We're trapped, we're trapped, they are—" "Shut up, Rodney! Wass, I'm only two sections from the edge. I'll check here." "No go," Martin said to Wass. He bit at his lower lip. "I think it must be all around us." He was silent for a time, exploring the consequences this?" He shook his head angrily, saying, "Judging by reports of the rest of Wass said coldly, "He's right, Martin." Wass' face, Martin saw, was sober. "I tried to call the ship. No luck." "Is this it," Wass murmured, "or an auxiliary?" "No. Wass, how much time have we?" "The ship leaves in eleven hours." think you're doing?" "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 out." time it takes us to get to the lifeboat, fly to the ship, land, stow Martin said, "Not necessarily. You go the way the wind does, always 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—" "Make one move toward that switchboard and I'll stop you where you stand!" After a moment, Wass switched his flashlight back on. He said quietly, "He's right, Rodney. It would be sure death to monkey around in here." "Well...." Rodney turned quickly toward the black arch. "Let's get out of here, then!" Martin hung back waiting for the others to go ahead of him down the Wass laughed rudely. "Have you a better idea?" "We're wearing heavy suits and bulky breathing units. We have no equipment." to themselves." "Anyway," Martin decided, "we can take a look down below." a circle. "No supports. No supports anywhere. What keeps all that up there?" The edge of the city—the city which was a dome of force above and a bowl of metal below. After a long time, Wass sighed. "Well, skipper...?" some point twisted away from their evolutionary spiral, plagued by a sort of racial insanity. Light from their torches was reflected, as from glass. "All right," Rodney said belligerently into his radio. "What's holding up the procession?" Wass undertook to explain. Why not, after all? Martin asked himself. It was in Wass' own interest. In a moment, all three were standing before 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 not?" 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." find a way out of here." He started up the ramp. "Besides, we've no water." Rodney came last up the ramp, less jaunty now, but still holding the take off. Let's search awhile first. Let this be a last resort." Rodney jerked his head negatively. "No. Now, I know you, Martin. 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. The slight, blond man stood unmoving. "I'm with you, Martin, but, as a last resort it might be better to be blown sky high than to die gradually—" Martin was watching Rodney, struggling to get up. "I agree. As a last "Seven hours," Wass said quietly, "until take-off." think it's the last." They walked down the ramp and stood together, silent in a dim pool of artificial light on the bottom level of the alien city. Wass agreed. "And the survivors retired here. Why?" before the war as a retreat." He turned impatiently. "How should I know?" Wass turned, too, persistent. "But the planet was through with them." "In a minute," Martin said, too irritably, "we'll have a sentient Wass said, "All this had a purpose, once...." "We'll disperse and search carefully," Martin said. "I wonder what the pattern was." Then—"It wasn't.... Why did you close the hatch then?" Martin went to the wheel. He noticed Wass was standing behind Rodney For a little while he was alone. Then—causing a gasp from Wass, a harsh expletive from Rodney—a switches and blow yourself to smithereens?" Wass sighed and refused to meet Martin's gaze. Martin looked at him disgustedly, and then began to descend the rope, slowly, peering into the infinite, sparkling darkness pressing around him. At the bottom of the rope he sank to his knees in dust, and then was held even. He stamped his feet, and then, as well as he was able, did a standing jump. He sank no farther than his knees. Rodney began the descent. Looking up, Martin saw Wass above Rodney. "All right, Wass," Martin said quietly, as Rodney released the rope and sank into the dust. "Not me," the answer came back quickly. "You two fools go your way, I'll go mine." "Wass!" The going was hard. The dust clung like honey to their feet, and eddied 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. "Of course," Martin growled. There was silence again, the silence of almost-exhausted determination. The two men lifted their feet out of the dust, and then laboriously plunged forward, to sink again to the knees, repeated the act, times without number. Then Wass broke his silence, taunting. "The ship leaves in two hours, Martin. Two hours. Hear me, Rodney?" Martin pulled his left foot from the sand and growled deep in his Rodney stared. "Wass!" he shouted. "We've found a way out!" The grate groaned upward and stopped. Wass babbled incoherently into the radio for a moment, and then he began to scream. you answer?" "We couldn't do anything for him."

<question>:
Why does Wass end up being sent back to the lifeboat?

<options>:
A He cannot be trusted, and the others make him leave.
B He must make contact with the mother ship because one of the others was injured.
C He forgot the camera and has to go back to get it.
D His attitude is bringing the rest of them down, so they make him leave.

<answer>:

C