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 U.S. copyright on this publication was renewed.] I The girl with the Slider egg glittering in her hair watched the bailiff lead Asa Graybar out of the courtroom. He recognized her as Tom Dorr, Hazeltyne's general manager, was her escort. Asa felt certain, without proof, that Dorr was the man who had framed him for the charge of grand theft by secreting a fresh Slider egg in his to be a muck man, Jumpy. I'm going out to Jordan's Planet and hunt Slider eggs." "Smuggling? It won't work." Asa didn't answer. The Hazeltyne company had gone after him because he had been working on a method of keeping Slider eggs alive. The Hazeltyne company would be happy to see him mark time for five years 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 duplicate. He might even be able to cause trouble for Hazeltyne. His only problem would be staying alive for a year. Asa raised his eyebrows. "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?" grasshopper despite the double gravity. But we can't make you like the sight of yourself. And we can't guarantee that a Slider won't kill you." "Still," Asa mused aloud, "it would mean a nice bankroll waiting at the Graybar was confined to a small cabin that was opened only for a guard 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 flashes maybe four times a day. So I stole a new one and got caught." Asa had held a Slider egg in his hand as he gazed into it. He could understand. The shell was clear as crystal, taut but elastic, while Electrical instruments picked up static discharges from the egg, but the phenomenon remained a mystery. Hardly anyone faced with the beauty of a Slider's egg bothered to question its workings. For a few expectant moments there would be only random, fitful gleamings, and then there would be a wild coruscation of light, dancing from one filament to the next in a frenzy of brilliance. 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 ever seen. If Asa had found a means of keeping them alive it would have made him wealthy at the expense of the Hazeltyne monopoly. "You know what I think?" Kershaw asked. "I think those flashes are the egg calling its momma. They sparkle like a million diamonds when you scoop one out of the muck, and right away a Slider always comes swooping out of nowhere at you." Sliders?" Kershaw grinned. "First you try to catch it with a rocket. If you miss you start leaping for home. All this time you're broadcasting for help, you understand. When the Slider catches you, you leap up while it buries its jaws in the mud where you were just standing. You dig your claws in its back "Do what he says," Kershaw whispered to Graybar. "He's sort of a trusty Next morning Furston passed out guns, knives, radios, and pouches to Furston sent Graybar and Kershaw out together so that the veteran could Sliders, but this meant little, for the beasts lived under the mud as much as on top of it. mud, lovingly to his cheek, and then lifted it to eye level. "Just look at it." A SLIDER EGG The egg was flashing with a mad radiance, like a thousand diamonds being splintered under a brilliant sun. Static crackled in Asa's upon row of teeth. Before Asa could draw his gun the Slider lowered its head to the ground, dug two front flippers into the mud and shot and Graybar, sector eight, five miles out. Hurry!" "Graybar?" asked a voice in his earphone. "What's up?" "We've got an egg but a Slider wants it back." "On the way." Asa hopped back to the clearing. Kershaw must have been bowled over by the Slider's first rush, for he was trying to hop on one leg as if the other had been broken. The egg lay flickering on top of the mud where Kershaw had dropped it. The Slider, eight flippers on each side working madly, was twisting its thirty feet of wormlike body around for another the Slider turn toward the patch of weeds where he would land. His legs were tensed to leap again the moment he hit the mud, but he saw the Slider would be on top of him before he could escape. As he landed he thrust his gun forward almost into the mouth of the creature and fired again. "Last time I was here there was about one mucker killed for every six eggs brought out. Of course you're not supposed to stand there admiring the eggs like I did while a Slider comes up on you." Asa hopped over to the egg, which was still full of a dancing radiance where it rested on the mud. He scooped a hole in the muck and buried the egg. "Just in case there are any more Sliders around," he explained. "Makes no difference," said Kershaw, pointing upward. "Here comes the and leaned out. "I see you took care of the Slider," he said. "Hand over the egg." "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. "Nope. I want to make sure you come back." Asa turned his head to minutes, allowing time for Kershaw to be taken out at the settlement. After an hour passed Asa began to worry. He was sure Dorr would return for the egg. Finally he realized that Dorr could locate the egg approximately by the body of the dead Slider. Dorr could return for the egg any time with some other muck man to dig for it. coming?" There was no answer except the hum of carrier wave. If he tried to carry the egg back, Asa knew, Sliders would attack him all along the way. A man had no chance of getting five miles with an egg by himself. He could leave the egg here, of course. Even so he night. If he could stay awake, and if he didn't faint from hunger in this strange new body, and if the Sliders left him alone.... helicopter, coming in over the swamp. But what if it was Dorr, coming back alone to dispose of him without any witnesses? Asa leaped for the carcass of the dead Slider and took shelter behind it. "They feed at night, you know. And they eat their own kind," she said. "The Slider you killed would draw them like ants to jam." Asa glanced around quickly to make sure no Sliders had already come. He eyed the helicopter with distaste at the thought of what a flimsy fort it with a suction of its own. After a few minutes he had to give up. "We fight off the Sliders, then," she said, as matter of factly as if that problem was settled. "If it's any comfort, I know how to handle the machine-gun." "Nope. In this drizzle, at night, the Sliders would be on us before

<question>:
Why did Furston instruct Graybar to eat berries?

<options>:
A To help him acclimate to his new changeling diet.
B To demonstrate the impossibility of escaping imprisonment and seeking refuge on Jordan's Planet.
C To help him develop an immunity to toxic plant life.
D So that he would have enough energy to hunt Slider eggs.

<answer>:

B