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 got Four, he's happy. Why should he make himself unhappy? As a favor air. "Now look what you made me do! Just when I had the blamed thing 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. "Now, Grampa," Fred soothed, but his face was concerned. Fred, once called Young Fred, was Grampa's only son. He was sixty and his hair had 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 'That looks like heavy metals', and you said, 'Maybe uranium—'" "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. 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 "Go back to your games, Grampa," Fred said impatiently. "We've got work to do." 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?" "That's right, Four," Grampa muttered, "so I did. But whose money bought it?" "Well, now," Grampa protested, "I got a little put away yet. You'll be sorry when I'm dead and gone." for it. No dad-blamed machine is gonna outthink Grampa!" He snorted indignantly. Four shrugged his narrow shoulders and wandered to the view screen. "If it's Four's friend," Reba said firmly, "it can stay. If you don't Joyce stood up indignantly. "Well! And don't call me 'Grammy!' It makes me sound as old as that old goat over there!" She glared malignantly at Grampa. "If you'd rather have that blob than me—well!" She swept grandly out of the central cabin and into one of the private rooms that "I like you, gal. Never forget it." "I like you, too, Grampa. If you'd been a few years younger, Junior would have had competition!" "You bet he would!" Grampa leaned back and cackled. Then he leaned over confidentially toward Reba and whispered, "Beats me why you ever married a jerk like Junior, anyhow." 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 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." "That's the idea, Four. You'll be a Peppergrass yet. How about building me a pircuit?" "You get the other one figured out?" "It was easy," Grampa said breezily, "once you understood the sighed, wiped his mouth with the back of his hand, and carefully put the bottle away. "What is that stuff you drink, Grampa?" Four asked. "Tonic, boy. Keeps me young and frisky. Now about that pircuit—" "Did you ever work on Niccolò Tartaglia's puzzle about the three lovely "Yep," Grampa said. "Too easy." Four thought a moment. "There's a modern variation with three 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 be bothered with Grampa's invention before. Oh, no! Too busy. Accept what's the theory behind polarization?" Grampa looked at the four faces staring at him hopefully and the 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 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 Grampa squinted at her sagely. "That's what they said about the gravity polarizer before I invented it." "But you don't really know why it works," Junior persisted. "Well, no," Grampa admitted. "Actually I was just fiddling around with "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, cannibal takes over the other cannibal and leaves him there and—" "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, 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!" Grampa lowered his bottle and smacked his lips. "Well, boy," he said to "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?" 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—" "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 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. planet, we'll stay here until Four has a beard as white as Grampa's!" "Well!" Joyce said in a stiff, offended tone and sat back in her chair. Grampa lowered the nippled bottle from his lips and chortled. "Junior, I apologize for all the mean things I ever said about you. Maybe you got the makings of a Peppergrass yet." and he don't want Four to leave him.

<question>:
What is the relationship like between Four and Grampa?

<options>:
A Grampa sees Four as the least reliable of the family
B Four is mature for his age and Grampa enjoys his companionship
C Four challenges Grampa in a way that annoys him
D Grampa never could understand why Four didn’t get the intelligence of the other Peppergrass progeny

<answer>:

B