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

<passage>:
They packed their meager belongings while Dick finished his meal the Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] Bobby couldn't help wishing Pop would stand up just a little bit straighter. Not that he was ashamed of Pop it wasn't that at all. It so straight, his shoulders broad and firm. Standing beside him made Pop look sort of thin and puny his chest caved in like he was carrying a heavy weight on his shoulders. Bobby with a fierce loyalty, that S.S.P. man probably wouldn't even know what to look for if somebody put a microscope in front of him. Even if he was big and sturdy and broad-shouldered in his space blues. Mom said, "Bobby, what are "That's it, Pop!" said Dick suddenly. "There's the name for our surreptitiously, did not notice. Dick was fixing something in the ship. one of which, as soon as Pop got clearance, their ship would take off. Their ship! Bobby felt an eager quickening of his pulse his stomach Bobby bounded forward. "Can I push the button, can I, Pop? When we start, can I?" Dick was waiting before the open lock of the . Dick could do anything, everything at once. He took The Pooch into the circle of his left arm, helped his mother aboard, said, "Shut up, kid, you're Pop?" And he tickled The Pooch's dimpled cheek with an oily finger. "You act just like your mama," he said irrelevantly, and the baby gurgled. Eleanor cried, "Dick—those dirty hands!" Pop said, "Come along, Robert," and the others went inside. Bobby place, wheezing asthmatically. Bobby's ears rang suddenly with the mild compression of air when he swallowed, they were all right again. Dick saw him. "What are you doing here, kid? Didn't I hear Pop tell you to come below?" Bobby said, "I'm not a kid. I'm almost sixteen." "Just old enough," promised Dick, "to get your seat warmed if you don't do what you're told. Remember, you're a sailor on a spaceship now. Pop's the Skipper, and I'm First Mate. If you don't obey orders, it's "I'm obeying," said Bobby hastily. He followed his brother down the corridor, up the ramp, to the bridge. "Can I push the button when we take off, huh, Dick?" After his high expectations, it wasn't such a great thrill. Dick set the stops and dials, told him which button to press. "When I give the word, kid." Of course, he got to sit in the pilot's bucket-chair, which hammocks while Pop and Dick sat in observation seats. He waited, all Bobby jabbed the button in frantic haste. Suddenly the silence was shattered by a thunderous detonation. There was a massive hand pressing him back into the soft, yielding leather of his chair ball-like in the vastness of space. Earth, dwindling with each passing moment. Bobby moved to his side and watched Moira, too, and Eleanor and Mom, and even Dick. , Bobby had conceived void-travel to be one long, must not enter certain chambers, that he mustn't push his nose into things that didn't concern kids— Which offended Bobby, who was sixteen, or, anyway, fifteen and three-quarters. So they ate and they slept and they ate again. And Pop and Dick spelled between hands, about the dad-blame nonsensical way Dick was handling . It has performed beautifully. You are a good spaceman." Dick flushed. "She's a good ship, Pop, even if she is thirty years old. "Rob, look! Off to the—the left, or the port, or whatever you call it! Is that our new home?" Bobby did not need to hear Pop's reply to know that it was. His swift intake of breath was enough, the shine in his eyes as he peered out the observation port. It was, thought Bobby, not a bad looking little place. But not anything to get all dewy-eyed about, like Pop was. Dick said softly, "All right, Pop. Let's check and get ready to set 'er down...." II It was not Dick's fault. It was just a tough break that no one had the irrevocable movements of a grounding spaceship. Dick should have Dick stared at it, a look of angry chagrin in his eyes. "Well, blast me for an Earth-lubbing idiot! Do you see that, Pop?" Pop looked like he had shared Dick's persimmon. Dick cut off the gravs, then the hypos. As the last machine-created sound died away from the cabin, Bobby heard the high scream of atmosphere, raging and tearing at the ages long. While Dick labored frantically at the controls, while Moira And then, suddenly— "Hold tight! We're grounding!" cried Dick. And instinctively Bobby braced himself for a shock. But there was only a shuddering jar, a lessening of the roar that beat upon their Dick grinned shakily. "Well!" he said. "Well!" Pop unbuckled his safety belt, climbed gingerly out of his hammock, moved to the port, slid back its lock-plate. Bobby said, "Can you see Mom cried, "But—but our supplies, Dick! What are we going to do for "We'll worry about that later. Right now we've got to think of ourselves. That-aboy, Bobby! Thanks for getting 'em out. You girls remember how to climb into 'em? Eleanor—you take that oversized one. had all donned spacesuits. Bloated figures in fabricoid bulgers, they followed Dick to the airlock. It was weird, and a little bit frightening, but to Bobby it was thrilling, too. This was the sort of Pop remembered the medical kit and the tool-box, Grampaw was laden down with blankets and clothing, Dick burdened himself and Bobby with armloads of such things as he saw and forevisioned need for. was waist—no, breast-deep—by the time all were gone save Bobby and Dick. Bobby, whose imagination had already assigned him the command of the foundering ship, wanted to uphold the ancient traditions by being the last to leave. But Dick had other ideas. He shoved Bobby—not too gently—into the lock. Then there was water, black, solid, forbidding, about him. And the outer door opening. against his impervite helmet off to his right, not distant, was a rising smudge that must be the mainland. A dark blob popped out of the water. Dick. Dick's voice was metallic through the audios of the space-helmet. "All here, Pop? Everybody all right? Swell! Let's strike out for the shore, there. Stick together, now. It isn't far." Pop said, "The ship, Richard?" Dick asked, "Isn't that a remarkably slow rotation? For such a tiny planet, I mean? After all, Eros is only one hundred and eighty odd miles in circumference—" Hey?" Dick roused himself. "Right you are, Grampaw," he said. "You can remove your bulgars. I've done to make their beach camp-site comfortable. All members of the family were waiting now for Dick to return. Pop said seriously, "I'm afraid you'll have to eat them and like them for a little while, Father. We can't get fresh foods until we're settled we can't settle until—Ah! Here comes Dick!" "I'll eat 'em," grumbled Grampaw, "but be durned if I'll like 'em. What'd you l'arn, Dicky-boy?" Dick removed his helmet, unzipped himself from his bulger, shook his

<question>:
Why does Pop prefer Dick's help with the spaceship more than Bobby's?

<options>:
A Bobby makes too many errors, which prevents him from receiving important tasks like Dick does.
B Dick is more mature and takes the journey seriously, unlike Bobby.
C Bobby does not cooperate with Pop as well as Dick does.
D Dick is more physically fit than Bobby, which is the reason Pop favorites Dick.

<answer>:

B