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

<passage>:
Morgue Ship By RAY BRADBURY This was Burnett's last trip. Three more shelves to fill with space-slain warriors—and he would be among the living again. [Transcriber's Note: This etext was produced from He heard the star-port grind open, and the movement of the metal claws groping into space, and then the star-port closed. There was another dead man aboard the Constellation . the laboratory where the shelves went up and down, numbered in scarlet, keeping the bodies of soldiers from all further harm. gown, staring at his fingers gloved in bone-white rubber feeling all tight and wild inside himself. It went on for days. Moving the ship. Opening the star-port. Extending the retriever claw. Plucking some poor warrior's body out of the void. He didn't like it any more. Ten years is too long to go back and forth from Earth to nowhere. You came out empty and you went back full-cargoed with a lot of warriors who didn't laugh or talk or smoke, who just lay on their shelves, all one hundred of them, waiting for a decent burial. deep. It didn't belong to him anymore. Rice said: "Boyohbody! Two more pick-ups and back to New York. Me for a ten-day drunk!" into a floor incinerator mouth. Back to Earth. Then spin around and shoot right out again in the trail of the war-rockets that blasted one another in galactic fury, to sidle up behind gutted wrecks of ships, salvaging any bodies still intact after the conflict. Two men. Rice and himself. Sharing a cozy morgue ship with a hundred other men who had forgotten, quite suddenly, however, to talk again. All the color is ahead of you. The drive of orange rocket traces across stars, the whamming of steel-nosed bombs into elusive targets, the titanic explosions and breathless pursuits, the flags and the excited glory are always a million miles ahead. He bit his teeth together. You come along when space has settled back, when the vacuum has stopped trembling from unleashed forces between worlds. You come along in the dark quiet of death to find the wreckage plunging with all the fury of ribs. You see bodies, each in its own terrific orbit, given impetus by grinding collisions, tossed from mother ships and dancing head over 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 your job with mechanical hands. But even a machine breaks down.... day you played hookey in the tenth grade, and I've been in the thick of it. When there's nothing left but seared memories, I'll be prowling 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!" "And if it does? Have we got guns aboard this morgue-ship? Are we a battle-cuiser to go against him?" "We'll radio for help?" "Yeah? If there's a warship within our radio range, seven hundred thousand miles, we'll get it. Unfortunately, the tide of battle has swept out past Earth in a new war concerning Io. That's out, Rice." "You're one hell of a patriot, Sam Burnett!" Burnett reached out with one long finger, tapped it quietly on Rice's barrel-chest. "Haul a cargo of corpses for three thousand nights and days and see how patriotic you feel. All those fine muscled lads bloated and crushed by space pressures and heat-blasts. Fine lads who 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 never catch up with the war! 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 chugging of blood-pumps below. In the silence he reached up with quick worn only on the head. You have to look quickly to notice it, and, unfortunately, viewed as you saw it, outside the ship, floating in the void, not discernible aboard the Constellation alive. It's a welcome change." "Go find it!" snapped Rice, hotly. "I will." One hand, blue-veined, on the ladder-rungs, Lethla paused. "I know you're weaponless ladder. Two long breaths later something crashed metal and glass and coils. The radio. "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 unexpectedly yesterday near Mars. We were forced to take to the life-boats, scattering, Kriere and I in one, the others sacrificing their lives to cover our escape. We were lucky. We got through the Earth cordon unseen. But luck can't last forever. "We saw your morgue ship an hour ago. It's a long, long way to Venus. We were running out of fuel, food, water. Radio was broken. Capture 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 brief exams, returning alien corpses to space later." Rice's voice was sullen. "A set-up for you, huh? Traveling under the protection of the Purple Cross you can get your damned All-Mighty safe "No tricks," said Lethla. Burnett scowled and smiled together. "No tricks. You'll have Kriere on board the Constellation if they cooperated. But there were a lot of warriors sleeping on a lot of numbered shelves being ripped, slaughtered, flung to the vacuum tides. Ten years of hating a job and hoping that some day there would be a last trip and it would all be over. trick." "Cut power! We don't want to burn him!" Constellation artery—heart. There was a way. And there was a weapon. And the war would be over and this would be the last trip. Sweat covered his palms in a nervous smear. Constellation was about to end a ten-years' war. There was only one it had done a thousand times before but for the first time it was a good sound. And out of the star-port, at Sam Burnett's easily fingered directions, slid the long claw-like mechanism that picked up bodies from space. Lethla watched. He watched while Burnett exhaled, touched another lever and said: "You know, Lethla, there's an old saying that only dead men come aboard the Constellation . I believe it." "This is the hard way—" "Maybe. I dunno. Kind of nice to think of all those kids who'll never have to come aboard the Constellation "We haven't got a full cargo, boy." "Full enough for me, sir." "But still not full. If we went back to Center Base without filling

<question>:
What is the Constellation’s main mission?

<options>:
A To engage in combat with the enemy
B To collect the dead bodies of soldiers and preserve them for burial on Earth
C To collect the dead bodies of soldiers so they can be reanimated using advanced technology
D To salvage materials from wrecked warships

<answer>:

B