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 you've already got the answer. All you want from it then is decimal points." "That may be," Junior said stubbornly, "but I still want to know why this computer won't work. It won't even do simple arithmetic! Where's Four? He's the only one who understands this thing." rocked unsteadily on its flat stern before it decided to stay upright. Then all was quiet—outside. Inside the big, central cabin, Grampa waved his pircuit irately in the practically whipped, too!" Grampa was a white-haired 90-year-old who could still go a fast round or two with a man (or woman) half his age, but he had a habit of lapsing into tantrum when he got annoyed. begun to gray at the temples. "That landing was pretty rough, Junior." of exercising adult judgment and because he had the youngest adult reflexes, he sat in the pilot's chair, the control stick between his less than that of Mercury and yet a gravitational pull as great as Earth." Grampa started to say something, but an 8-year-old boy looked up from the navigator's table beside the big computer and said, "Well, gosh, Junior, that's why we picked this planet. We fed all the orbital data into Abacus, and Abacus said that orbital perturbations indicated that "And, Four," Reba said automatically, "don't call your father 'Junior.' Junior had won her was, to Grampa, the most hopeful thing he had ever noticed about the boy. "But everybody calls Junior 'Junior,'" Four complained. "Besides, Fred is Junior's father and Junior calls him 'Fred.'" "Stop picking on Junior," Joyce said sharply. She was Junior's mother "deserves anything anybody could say about him. There's no such thing, Junior. You ought to know by now that gravitation is the effect of the curving of space-time around matter. Einstein proved that two hundred Grampa looked up, obviously relieved to drop his act of intense concentration. "I'll tell you, boy. You play against the pircuit, "That's simple," Four said without hesitation. "The winning strategy is to—" "Don't be a kibitzer!" Grampa snapped. "When I need help, I'll ask for it. No dad-blamed machine is gonna outthink Grampa!" He snorted indignantly. Four shrugged his narrow shoulders and wandered to the view screen. "What about macro-organisms—" Reba began, but the boy was gone already. Reba's face was troubled. "That boy!" she said to Junior. "Sometimes I think we've made a terrible mistake with him. He should have friends, play-mates. He's more like a little old man than a boy." But Junior nodded meaningfully at Fred and disappeared into the chart married a jerk like Junior, anyhow." thought he might grow into a man like his grandfather." Grampa turned red and looked quickly toward Four. The boy was staring me a pircuit?" "You get the other one figured out?" "It was easy," Grampa said breezily, "once you understood the principle. The player who moved second could always win if he used the right strategy. Dividing the thirteen lights into three sections of followed closely by Junior. They were sweat-stained and weary, Junior shrugged helplessly and collapsed into a chair. "Your guess is as good as anybody's." "Then we've wasted another week on a worthless rock," Joyce complained. "A good thing, too," Junior said glumly, "because this looks like the end of our search. Short of a miracle, we'll spend the rest of our into a straight line. That makes the ship take off and continue The faces looked at him silently. Finally Joyce could endure it no longer. "That's just nonsense! You all know it. Grampa's no genius. He's just a tinkerer. One day he happened to tinker out the polarizer. He doesn't know how it works any more than I do." "Now wait a minute!" Grampa protested. "That's not fair. Maybe I didn't figure out the theory myself, but I read everything the scientists ever wrote about it. Wanted to know myself what made the as I remember. Now me—I'm like Edison. I do it and let everybody else worry over 'why.'" "But you don't really know why it works," Junior persisted. "Well, no," Grampa admitted. "Actually I was just fiddling around with "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. "He's why the flivver won't work. What Grampa invented was a linear The land of the Fweep rotated once on its axis, and Grampa lowered "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. Junior dug one of the counters out of the supply cabinet and aimed the something with him. It's preposterous that we should be detained here at the whim of a mere blob!" he's got to have for one reason or another, so he just naturally bends the space-time continuum around him—conscious or subconscious, I don't know. But protoplasm is always more efficient than machines, so the flivver won't move." he 'eats' everything. And violence might be more dangerous to us than to him. "Maybe he developed," Four offered. "It seems to me that he's bigger Reba looked at Fweep kindly. "We can thank the little fellow for that, anyway." "I thank him for nothing," Joyce snapped. "He lured us down here by making us think the planet had heavy metals and I want him to let us go immediately !" Grampa lowered his bottle and smacked his lips. "Well, boy," he said to Fred, "I thought you'd never do that. Didn't think you had it in you." "What I can't understand," Junior said thoughtfully, "is why the 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 "He's no more improbable than people," said Four. "Less than some I've known," Grampa conceded. "If he can eat anything," Reba said, "why does he keep sweeping the cabin for dust and lint?" "He wants to be helpful," Four replied without hesitation, "and he's lonely. After all," he added wistfully, "he's never had any friends." "How do you know all these things?" Joyce asked from her doorway, "Fwiend," it said. "Well, now," Grampa said maliciously, his eye on Joyce, "that's no front of an open fire, and Junior sat at the computer's keyboard "Junior!" said Joyce, shocked. Junior swung around impatiently. "Sorry, Mother, but this damned thing Junior turned back to the keyboard and studied it, his chin in his can work on." "I take it all back," said Grampa. "That computer won't help you with this problem, Junior. This ain't a long, complicated calculation it's and he don't want Four to leave him.

<question>:
Why did Junior land the ship so roughly?

<options>:
A He was not skilled at his work
B The planet had a variable gravity field
C He kept his thumb on the on-off button
D He didn't pay attention to the scouting data

<answer>:

B