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 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 Grampa was a white-haired 90-year-old who could still go a fast round "Now, Grampa," Fred soothed, but his face was concerned. Fred, once Grampa started to say something, but an 8-year-old boy looked up from "That's enough, Four," Junior interrupted. "Never mind what I said." Those were the Peppergrass men, four generations of them, looking remarkably alike, although some vital element seemed to have dwindled until Four looked pale and thin-faced and wizened. "And, Four," Reba said automatically, "don't call your father 'Junior.' It sounds disrespectful." Reba was Four's mother and Junior's wife. On her own, she was a red-haired beauty with the loveliest figure this side of Antares. That 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 Grampa was still waving his puzzle circuit indignantly. "See!" The Grampa knitted his bushy, white eyebrows and petulantly pushed the last button on his pircuit. The last light went out. "You've got work to do, have you? Whose flivver do you think this is, anyhow?" "It belongs to all of us," Four said shrilly. "You gave us all a sixth share." "That's right, Four," Grampa muttered, "so I did. But whose money bought it?" "You, Grampa," Fred said. "Well, now," Grampa protested, "I got a little put away yet. You'll be "Well, now," said Grampa, blinking, "how'd you find out about that? Grampa looked up, obviously relieved to drop his act of intense for it. No dad-blamed machine is gonna outthink Grampa!" He snorted indignantly. Four shrugged his narrow shoulders and wandered to the view screen. "Look!" he said suddenly. "This planet not only has flora—it has fauna." He rushed to the air lock. "Four!" Reba called out warningly. 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. "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." at Grampa. "If you'd rather have that blob than me—well!" She swept Grampa glanced warily at Joyce's door to make sure it was completely closed and then cocked a white eyebrow at Reba. "Good for you, Reba!" "Why, thanks, Grampa," Reba said, surprised. "I like you, too, Grampa. If you'd been a few years younger, Junior "You bet he would!" Grampa leaned back and cackled. Then he leaned 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 "That's the idea, Four. You'll be a Peppergrass yet. How about building 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." "Yep," Grampa said. "Too easy." Four thought a moment. "There's a modern variation with three Grampa reached down to pat it. For an instant, his hand disappeared As if in response, the flivver vibrated. Grampa looked querulously glared venomously at Grampa. "We've still got Fweepland," Four said solemnly. Grampa looked up from his pircuit and said, "If I were you, Junior, I Grampa gave him a sarcastic grin. "Now you're curious, eh? Couldn't be bothered with Grampa's invention before. Oh, no! Too busy. Accept Grampa looked at the four faces staring at him hopefully and the "Now wait a minute!" Grampa protested. "That's not fair. Maybe Grampa squinted at her sagely. "That's what they said about the gravity "Well, now," Grampa said in bafflement, "it rightly should, you know." 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. "I could think of worse things," Reba said. "I like your spunk, Reb," Grampa muttered. "Speaking of children," Junior said, "where's Four?" "Here." Four came through the airlock and trudged across the room, carrying a curious contraption made of tripod legs supporting a The land of the Fweep rotated once on its axis, and Grampa lowered the nippled bottle from his lips. He sighed. "I got it figured out, Four," he said, holding out the pircuit proudly. "A missionary takes "And blow him up? I don't think it's possible, but even if it were, it 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!" "And he doesn't reproduce?" Reba asked sympathetically. Reba looked at Fweep kindly. "We can thank the little fellow for that, Grampa lowered his bottle and smacked his lips. "Well, boy," he said to "Give her one for me!" Grampa called. "He wants to be helpful," Four replied without hesitation, "and he's lonely. After all," he added wistfully, "he's never had any friends." "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—" "Joyce!" Reba cried, horrified. "Grampa was joking, but you actually mean it. Four is only a baby and yet you'd let him—" "Never mind, Reba," Four said evenly. "It was just what I was going to suggest myself. It's the one really logical solution." 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 Grampa lowered the nippled bottle from his lips and chortled. "Junior, because he doesn't like gravity that's polarized in a straight line, and he don't want Four to leave him.

<question>:
Why was Grampa happy with Reba?

<options>:
A She had a brilliant smile
B She stood up to Joyce
C She liked him
D She wanted Four to be happy

<answer>:

B