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

<passage>:
"Now Fweep ain't the brightest creature in the Universe, so he can't understand why we're so gosh-fired eager to leave. And as long as he's got Four, he's happy. Why should he make himself unhappy? As a favor to Four, he'd let us leave—if we'd leave Four here with him, which we Four? He's the only one who understands this thing." "He's outside, playing in the meadow with Fweep," Reba said, her voice soft. "No, here they come now." Inside the big, central cabin, Grampa waved his pircuit irately in the "And, Four," Reba said automatically, "don't call your father 'Junior.' noticed about the boy. "But everybody calls Junior 'Junior,'" Four complained. "Besides, Fred is Junior's father and Junior calls him 'Fred.'" "Go back to your games, Grampa," Fred said impatiently. "We've got work Grampa knitted his bushy, white eyebrows and petulantly pushed the last "That's right, Four," Grampa muttered, "so I did. But whose money indignantly. Four shrugged his narrow shoulders and wandered to the view screen. "Four!" Reba called out warningly. The thing was a featureless blob, a two-foot sphere of raspberry gelatin, but it was alive. It rocked back and forth in front of Four. It opened a raspberry-color pseudo-mouth and said plaintively, "Fweep? Fweep?" Joyce drew her chair farther back toward the wall, revulsion on her face. "Four! Get that nasty thing out of here!" "You mean Fweep?" Four asked in astonishment. "I mean that thing, whatever you call it." Joyce fluttered her hand impatiently. "Get it out!" Four's eyes widened farther. "But Fweep's my friend." "Nonsense!" Joyce said sharply. "Earthmen don't make friends with aliens. And that's nothing but a—a blob!" "Fweep?" queried the raspberry lips. "Fweep?" "If it's Four's friend," Reba said firmly, "it can stay. If you don't like to be around it, Grammy, you can always go to your own room." opened out from it. "Fweep?" asked the blob. "Sure," Four said. "Go ahead, fweep—I mean sweep." and to himself, too." Reba smiled at Grampa brilliantly. "And maybe I thought he might grow into a man like his grandfather." Grampa turned red and looked quickly toward Four. The boy was staring intently at Fweep. "What you doing, Four?" "Trying to figure out what Fweep does with the sweepings," Four said absently. "The outer inch or two of his body gets cloudy and then slowly clears. I think I'll try him with a bigger particle." "What is that stuff you drink, Grampa?" Four asked. "Yep," Grampa said. "Too easy." cramped old flivver—and we don't have many of them to spare!" She glared venomously at Grampa. "We've still got Fweepland," Four said solemnly. "Fweepland?" Reba repeated. "It's these '23 models," Grampa put in disgustedly. "They never were any good." The land of the Fweep turned slowly on its axis. The orange sun set and be bothered with Grampa's invention before. Oh, no! Too busy. Accept Grampa looked at the four faces staring at him hopefully and the "I could think of worse things," Reba said. "I like your spunk, Reb," Grampa muttered. "Speaking of children," Junior said, "where's Four?" small box from which dangled a plumb bob. Behind Four, like a round, raspberry shadow, rolled Fweep. "Fweep?" it queried hopefully. "Not now," said Four. "Where've you been?" Reba asked anxiously. "What've you been doing?" "I've been all over Fweepland," Four said wearily, "trying to locate its center of gravity." "It shifts." "That's impossible," said Junior. "Not for Fweep," Four replied. "What do you mean by that?" Joyce suspiciously asked. "It shifted," Four explained patiently, "because Fweep kept following me." "Fweep?" Junior repeated stupidly. "Fweep?" Fweep said eagerly. "Not now, Grampa," Four said inattentively as he watched Fweep making the grand tour of the cabin. The raspberry sphere swept over a scattering of crumbs, engulfed them, absorbed them. Four looked at Joyce. Joyce was watching Fweep, too. "Rat poison?" Four asked. Joyce started guiltily. "How did you know?" "There's no use trying to poison Fweep," Four said calmly. "He's got no enzymes to act on, no nervous system to paralyze. He doesn't even use what he 'eats' on a molecular level at all." might be a trifle more than disastrous for us." Four giggled at the thought. Joyce glared at him furiously. "Four! Act your age! We've got to do something with him. It's preposterous that we should be detained here at the whim of a mere blob!" we'll just have to do away with it." "How?" asked Four. "Fweep's skin is pretty close to impervious and you can't shoot him, stab him or poison him. He doesn't breathe, so "Don't call me 'Grammy!' Well, what are we going to do, just sit around and wait for that thing to die?" "We'd have a long wait," Four observed. "Fweep is the only one of his kind on this planet." "Well?" Fred said. "Fweepland, as Four calls it, kept its atmosphere and its water, which a planet this size ordinarily would have lost by now." Reba looked at Fweep kindly. "We can thank the little fellow for that, us from being squashed—and then quit." "Fweep didn't recognize it immediately, didn't know what it was or where it came from," Four explained. "All he knew was he didn't like linear polarization and he neutralized it as soon as he could. That's "Makes you wonder how something like Fweep could ever develop." "He's no more improbable than people," said Four. "He wants to be helpful," Four replied without hesitation, "and he's lonely. After all," he added wistfully, "he's never had any friends." "Well? What did it say?" "He said he didn't want his friend to leave him." At the word, Fweep rolled swiftly across the floor and bounced into Four's lap. It nestled against him lovingly and opened raspberry lips. "Fwiend," it said. "Well, now," Grampa said maliciously, his eye on Joyce, "that's no problem. We can just leave Four here with Fweep." In a voice filled with sanctimonious concern, Joyce said, "That's quite a sacrifice to ask, but—" "Never mind, Reba," Four said evenly. "It was just what I was going to suggest myself. It's the one really logical solution." "Fwiend," said Fweep gently. The land of the Fweep turned like a fat old man toasting himself in front of an open fire, and Junior sat at the computer's keyboard swearing in a steady monotone. planet, we'll stay here until Four has a beard as white as Grampa's!" Fweep won't let our polarizer work. He won't let our polarizer work because he doesn't like gravity that's polarized in a straight line, and he don't want Four to leave him.

<question>:
Why did Grampa suggest leaving Four behind on the planet

<options>:
A Because he wanted a reaction from Joyce
B Because he thought it was the only way he could go home
C Because Fweep didn't want Four to leave
D Because Four liked Fweep

<answer>:

A