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

<passage>:
The work wasn't hard, but there were some sacrifices. You had to give up hope and freedom—and being human! old Hazeltyne's daughter Harriet, no doubt come to see justice done. she had thought crimes were committed by shriveled, rat-faced types, "Five or one." "Take the five," Jumpy advised. "Learn basket-weaving in a nice air-conditioned rehab clinic. A year on a changeling deal will seem a lot longer, even if you're lucky enough to live through it." Asa took four steps to the far wall of the cell, stood there briefly with his head bent and turned to face Jumpy. "Nope," Asa said softly. "I'm going into a conversion tank. I'm going to be a muck man, Jumpy. I'm going out to Jordan's Planet and hunt Slider eggs." "Smuggling? It won't work." of so-called social reorientation. But if he could get out to Jordan's Planet, with his physiology adapted to the environment of that wretched world, he could study the eggs under conditions no laboratory could His only problem would be staying alive for a year. An interview with a doctor from the Conversion Corps was required for all persons who elected changeling status. The law stated that potential changelings must be fully informed of the rights and hazards of altered shape before they signed a release. The requirement held whether or not the individual, like Asa, was already experienced. By the time humanity traveled to the stars, medical biology had made it possible to regenerate damaged or deficient organs of the body. Regeneration was limited only by advanced age. Sometime after a man's new cells. A fifth set of teeth was usually one's last. As long as temples particularly popular. From regeneration it was a short step to specialized regrowth. The techniques were perfected to adapt humans to the dozen barely habitable worlds man had discovered. Even on Mars, the only planet outside Earth in the solar system where the human anatomy was remotely suitable, a man could work more efficiently with redesigned lungs and temperature controls than he could inside a pressure suit. On more bizarre planets a few light-years away the advantages of changeling bodies were greater. Unfortunately for planetary development companies, hardly anyone wanted to become a changeling. High pay lured few. So a law was passed permitting a convicted criminal to earn his freedom by putting in one year as a changeling for every five years he would otherwise have had to spend in rehabilitation. "What types of changelings do you have orders for right now, doctor?" Asa asked the man assigned to his case. It would look suspicious if he asked for Jordan's Planet without some preliminary questions. "Four," answered the doctor. "Squiffs for New Arcady. Adapted for climbing the skycraper trees and with the arm structure modified into pseudo-wings or gliding. Then we need spiderinos for Von Neumann Two. If you want the nearest thing we have to Earth, there's Caesar's Moon, where we'd just have to double your tolerance for carbon monoxide and make you a bigger and better gorilla than the natives. Last, of course, there's always a need for muck men on Jordan's Planet." The doctor shrugged, as if naturally no one could be expected to choose Jordan's Planet. Asa frowned in apparent consideration of the alternatives. "What's the pay range?" he asked. "Why such a difference? Everyone knows about muck men living in the mud while they hunt Slider eggs. But don't your conversions make the changeling comfortable in his new environment?" end of the year." He leaned forward to fill in the necessary form. Since it was cheaper to transport a normal human than to rig special environments in a spaceship, every planet operated its own conversion chambers. On the space freighter that carried him from Earth Asa Graybar was confined to a small cabin that was opened only for a guard to bring meals and take out dirty dishes. He was still a prisoner. spaceships nor worked in the dome settlements on harsher worlds, he decided it was his imagination. He might have been dead cargo for all he learned about space travel. Nevertheless his time was not wasted. He had as a companion, or cellmate, another convict who had elected conversion to muck man. More important, his companion had done time on Jordan's Planet before and had wanted to return. "It's the Slider eggs," explained Kershaw, the two-time loser. "The ones you see on Earth knock your eyes out, but they've already begun to die. There's nothing like a fresh one. And I'm not the first to go crazy over them. When I was reconverted and got home I had nine thousand dollars waiting for me. That'll buy a two-year-old egg that It took about four years for a Slider egg to die. Beauty, rarity and fading value made the eggs a luxury item like nothing the world had you scoop one out of the muck, and right away a Slider always comes When the Slider catches you, you leap up while it buries its jaws in comes—and if they don't shoot off your head by mistake—you live to tell the tale." II Asa Graybar kept his normal form on Jordan's Planet just long enough to learn the discomfort of double gravity. He was told he needed another to lose consciousness. consciousness faded completely he realized that no one got a chance to back out of becoming a changeling, that he was on his way to the conversion tank right now. where they had been left to revive from conversion. and warden and parole officer rolled into one." "Everything that grows on this planet is poison. So if you got any ideas of hiding out till your term is up, forget 'em. Right here is where you eat." Gazing at him with repugnance, after witnessing the end of his session him. Dorr had tried to get rid of him once and was now in an excellent position to make the riddance permanent. assigned the sectors to be worked during the day. Finally he called Graybar aside. "In case you don't like it here," Furston said, "you can get a week knocked off your sentence for every egg you bring in. Now get out there before it was thrown away, to make sure it didn't conceal an egg. As he "We've got an egg but a Slider wants it back." with shreds of alien flesh scattered by the rocket's explosion. "Last time I was here there was about one mucker killed for every six "Not this trip," Dorr answered. "Now give me the egg." Asa didn't hesitate. "The egg stays with me," he said softly. "You do what I tell you, mucker," said Dorr. approximately by the body of the dead Slider. Dorr could return for the egg by himself. He could leave the egg here, of course. Even so he would be lucky if he got back, following a hazy compass course from which he and Kershaw had certainly deviated on their outward trip. way. The workers were supposed to home in on radio signals, if they lost their bearings, but Dorr would deny him that help. What was the night like on Jordan's Planet? Maybe Sliders slept at this strange new body, and if the Sliders left him alone.... carcass of the dead Slider and took shelter behind it. Asa leaped forward in consternation. Not only was his chance of safe passage back to the settlement wrecked, but now he would have the "What happened?" "They feed at night, you know. And they eat their own kind," she said. "Anyway," Harriet said, "I told him he couldn't just leave you here and we started arguing. I lost my temper. He thought he had brought me to Jordan's Planet on a fancy tour. I told him the real reason I was here was to check up for my father on the way he was running things and hardly believe it yet. "Oh, back on Earth I can make a helicopter do stunts. But I wasn't used

<question>:
What happens to a changeling after their sentence is served?

<options>:
A They continue to hunt Slider eggs for the Hazeltynes.
B They are converted back to their normal body and returned to Earth.
C They maintain their conversion as a permanent reminder of their crimes.
D They can choose to stay on their new planet or return to Earth.

<answer>:

B