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 ain't gonna do. "That's the problem. All we got to do is figure out the answer. No use "He's outside, playing in the meadow with Fweep," Reba said, her voice Inside the big, central cabin, Grampa waved his pircuit irately in the or two with a man (or woman) half his age, but he had a habit of lapsing into tantrum when he got annoyed. to do." share." "That's right, Four," Grampa muttered, "so I did. But whose money bought it?" "You bet! And who made one hundred million dollars out of it that the rest of you vultures are just hanging around to gobble up when I die?" "And who spent it all trying to invent perpetual motion machines and longevity pills," Joyce said bitterly, "and fixed it so we'd have to go searching for uranium and habitable worlds all through this deadly sorry when I'm dead and gone." "You're never going to die, Grampa," Joyce said harshly. "Just before we left, you bought a hundred-year contract with that Life-Begins-At-Ninety longevity company." "Well, now," said Grampa, blinking, "how'd you find out about that? picture in toward the ship, sweeping through green, peaceful woodland and plain and blue lake until he stared down into the meadow at the he asked impatiently. "Well, what's all the mystery?" grandly out of the central cabin and into one of the private rooms that submerged in this family too long he's still a child to all of you and to himself, too." Reba smiled at Grampa brilliantly. "And maybe I "That's the idea, Four. You'll be a Peppergrass yet. How about building me a pircuit?" four each—" "That's right," Four agreed. "I can make you a new one by cannibalizing the other pircuit, but I'll need a few extra parts." "Tonic, boy. Keeps me young and frisky. Now about that pircuit—" "Did you ever work on Niccolò Tartaglia's puzzle about the three lovely brides, the three jealous husbands, the river and the two-passenger rowboat?" "Yep," Grampa said. "Too easy." Four thought a moment. "There's a modern variation with three followed closely by Junior. They were sweat-stained and weary, "Then we've wasted another week on a worthless rock," Joyce complained. She turned savagely on Fred. "This was going to make us all filthy rich. We were going to find radioactives and retire to Earth like billionaires. And all we've done is spent a year of our lives in this cramped old flivver—and we don't have many of them to spare!" She glared venomously at Grampa. real estate, it's worth almost as much as if it were solid uranium." "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 lives right here—involuntary colonists." rose again and stared down once more at the meadow where the improbable spaceship rested on its improbable stern. The sixteen Earth hours that If we get back to Earth," he amended. "You can't be Four's father. All over the Universe, gravity is the same, and if it's gravity, the polarizer will polarize it." be bothered with Grampa's invention before. Oh, no! Too busy. Accept without question the blessings that the Good Lord provideth—" around itself. That's how we've always known it until the invention of "And then you spent everything you got from it on those fool perpetual-motion machines and those crazy longevity schemes when any moron would know they were impossible." ironically. "Well, now," Grampa said in bafflement, "it rightly should, you know." "Which," Joyce interrupted, "might get picked up in a few centuries." "And make the best of what we've got," Reba went on, unheeding. "If we look at it the right way, it's quite a lot. A beautiful, fertile world. the resynthesizer it will keep us in food and clothes for years. By then, we should have a good-sized community built up, because out here we won't have to stop with one child. We can have all the babies we want." "You know the law: one child per couple," Joyce reminded her frigidly. "You can condemn yourself to exile from civilization if you wish. Not me." Junior frowned at his wife. "I believe you're actually glad it carrying a curious contraption made of tripod legs supporting a small box from which dangled a plumb bob. Behind Four, like a round, "Where've you been?" Reba asked anxiously. "What've you been doing?" "Well?" Fred prompted. "It shifts." "That's impossible," said Junior. "Not for Fweep," Four replied. "It shifted," Four explained patiently, "because Fweep kept following so heavy. He's why we can't leave." Four," he said, holding out the pircuit proudly. "A missionary takes over a non-rowing type cannibal, leaves him there, and then the rowing the grand tour of the cabin. The raspberry sphere swept over a scattering of crumbs, engulfed them, unbelievingly. Four nodded. "And that 'skin' of his—whatever it is he uses for might be a trifle more than disastrous for us." Four giggled at the thought. something with him. It's preposterous that we should be detained here at the whim of a mere blob!" he 'eats' Either way, you'd feel rather uncomfortable, Grammy." "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?" "Probably he's immortal." "And he doesn't reproduce?" Reba asked sympathetically. "Probably not. If he doesn't die, there's no point in reproduction. Reproduction is nature's way of providing racial immortality to mortal creatures." than when we first landed." "He must have been here a long, long time," in circles, and the matter business is not a cause but a result." "What I can't understand," Junior said thoughtfully, "is why the polarizer worked for a little while when we landed—long enough to keep us from being squashed—and then quit." cabin for dust and lint?" "He wants to be helpful," Four replied without hesitation, "and he's 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—" it would only say that the logical answer is the one I sug—" "Mother!" Junior warned. "We decided not to talk about it any more. Four is strange enough without encouraging him to think like a martyr. It's out of the question. If that's the only way we can leave this planet, we'll stay here until Four has a beard as white as Grampa's!" a simple problem in logic. It's a pircuit problem, like the one about the cannibals and the missionaries. We can't leave Fweepland because and he don't want Four to leave him.

<question>:
Why is the family travelling together?

<options>:
A As an opportunity for them to make money
B They narrowly escaped Earth’s destruction by blasting off in the spaceship together
C They are missionaries wanting to colonize new planets
D As a family vacation

<answer>:

A