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

<passage>:
groping into space, and then the star-port closed. There was another dead man aboard the warrior's body out of the void. into a floor incinerator mouth. Back to Earth. Then spin around and husk of his starved eyes and starved limbs. Starved for life. Starved for action. This would be his last trip, or he'd know the reason why! cooling in it. Shaking his head, he walked unsteadily toward the rungs that gleamed up into the air-lock, control-room sector of the rocket. He climbed without making any noise on the rungs. He kept thinking the one thing he couldn't forget. He bit his teeth together. You never catch up with the war. You come along when space has settled back, when the vacuum has stopped it you don't hear anything in space but your own heart kicking your ribs. feet forever and forever with no goal. Bits of flesh in ruptured space suits, mouths open for air that had never been there in a hundred billion centuries. And they kept dancing without music until you extended the retriever-claw and culled them into the air-lock. That was all the war-glory he got. Nothing but the stunned, shivering silence, the memory of rockets long gone, and the shelves filling up But even a machine breaks down.... Burnett didn't say anything, but he climbed the rest of the way, stood quietly in the grey-metal air-lock. The enemy official was as delicately made as a fine white spider. Eyelids, closed, were faintly blue. The hair was thin silken strands of pale gold, waved and pressed "It's Lethla!" Rice retorted. Burnett said, "Lethla?" And then: "Oh, yes! Kriere's majordomo. That "Don't say it calm, Sam. Say it big. Say it big! If Lethla is here in through the void picking up warriors and taking them back to the good green Earth. Grisly, yes, but it's routine. "As for Kriere—if he's anywhere around, he's smart. Every precaution is taken to protect that one." "But Lethla! His body must mean something!" bloated and crushed by space pressures and heat-blasts. Fine lads who Burnett swallowed and didn't say anything more, but he closed his eyes. He stood there, smelling the death-odor in the hot air of the ship, hearing the chug-chug-chug of the blood pumps down below, and his own heart waiting warm and heavy at the base of his throat. "This is my last cargo, Rice. I can't take it any longer. And I don't Lethla. He's number ninety-eight. Shove me into shelf ninety-nine Lethla was alive. He rose from the floor with slow, easy movements, almost like a dream. He didn't say anything. The heat-blast in his white fingers did all the knew why. Involuntarily, Burnett moved forward. Lethla moved like a the corners of his eyes he saw Rice's expression go deep and tight, biting lines into his sharp face. Rice got it out, finally. "How'd you do it?" he demanded, bitterly. "How'd you live in the void? It's impossible!" But what if the war catches up with you? What in hell would Lethla be wanting aboard a morgue ship? Lethla half-crouched in the midst of the smell of death and the halves of a microscopically thin chrysalis parted transparently off of his face. He shucked it off, trailing air-tendrils that had been inserted, hidden in the uniform, ending in thin globules of oxygen. He spoke. Triumph warmed his crystal-thin voice. "That's how I did it, Earthman." "Glassite!" said Rice. "A face-moulded mask of glassite!" Lethla nodded. His milk-blue eyes dilated. "Very marvelously pared to Lethla showed his needle-like teeth. "I thought it might be. Where's "I will." One hand, blue-veined, on the ladder-rungs, Lethla paused. "I know you're weaponless Purple Cross regulations. And this air-lock is safe. Don't move." Whispering, his naked feet padded white up the ladder. Two long breaths later something crashed metal and glass and Lethla came down. Like a breath of air on the rungs. "Interplanetary law declares it straight, Lethla! Get out! Only dead Lethla's gun grip tightened. "More talk of that nature, and only dead Lethla's voice came next: "Rather unfortunately, yes. He's still alive, heading toward Venus at an orbital velocity of two thousand m.p.h., wearing one of these air-chrysali. Enough air for two more hours. Our flag ship was attacked their lives to cover our escape. We were lucky. We got through the Earth cordon unseen. But luck can't last forever. we took the chance. We set a small time-bomb to destroy the life-rocket, and cast off, wearing our chrysali-helmets. It was the first time we had ever tried using them to trick anyone. We knew you wouldn't know we were alive until it was too late and we controlled your ship. We knew you picked up all bodies for Lethla bowed slightly. "Who would suspect a Morgue Rocket of providing "Enough!" Lethla moved his gun several inches. "No tricks," said Lethla. Lethla danced up, turned, waved his gun. "Come on." On the way up, Burnett thought about it. About Lethla poised like what more proper than that Kriere and Lethla should fill them? But, he the hole-rim, stepped up, faced Lethla in a cramped control room that "Now, where do you want this crate?" he asked Lethla easily. Lethla exhaled softly. "Cooperation. I like it. You're wise, Earthman." being ripped, slaughtered, flung to the vacuum tides. Ten years of "There's your Ruler now, Lethla. Doing somersaults. Looks dead. A good Lethla with an intent scowl. Funny. This was the first and the last alive. His stomach went flat, tautened with sudden weakening fear. water-blue uniform, emblems shining gold, heat-gun tucked in glossy jet holster. With Kriere aboard, chances of overcoming him would be eliminated. Now: Rice and Burnett against Lethla. Lethla favored Lethla had to be yanked off guard. Shocked, bewildered, where Lethla would send a bullet crashing into rib, sinew, to be rescued. way of drawing Lethla off guard, and it had to be from space. Lethla watched, intent and cold and quiet. The gun was cold and quiet, Lethla watched. know, Lethla, there's an old saying that only dead men come aboard the That was the only way to draw Lethla off guard. The horror on Lethla's face didn't go away as he fired his gun. Fists made blunt flesh noises. Lethla went down, weaponless and screaming. Rice kicked. After awhile Lethla quit screaming, and the claws come inside, and the star-port grind shut. Something wet and sticky covered his chest. "I said this was my last trip and I meant it. One way or the other, I'd have quit!" Lethla—number ninety-nine is Kriere. Three thousand days of rolling He could still see Rice standing over him for a long time, breathing out and in. Down under the tables the blood-pumps pulsed and pulsed,

<question>:
How does Lethla survive the vacuum of space?

<options>:
A He is an alien who does not need air to survive the void
B He is a mechanical robot that can function without air
C He uses the blood-pumps to suck oxygen from nearby bodies
D His suit supplies him with oxygen, and his transparent mask allows him to breathe it

<answer>:

D