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

<passage>:
The sight of an Earthman John Crownwall as he strode prehensile fingers, as he ignored the heavy gravity and heavier air of the unfamiliar planet. John Crownwall, florid, red-headed and bulky, considered himself to be a bold man. But here, Earthlings, that is." he felt distinctly unhappy. Crownwall Crownwall nodded. "In other of destroying them, and thereby If they carried out the threats of their present attitude, Earth would have to send Marshall to replace him. And if Crownwall couldn't do the job, thought Crownwall, then it was a sure bet that Marshall to Crownwall. "You broke our wouldn't have a chance. He climbed the great ramp, with its deeply carved Greek key design, toward the mighty entrance demonstrated an elaborate air of unconcern that he felt sure was entirely Crownwall and unexpectedly to Crownwall, gesture to be interpreted correctly, would be. He was correct. "Of course," His Effulgence said, Crownwall all but sagged with "we will give you any assurances but he assumed that his silence relief. A pair of guards, their purple hides smoothly polished and gleaming "Bunk," said Crownwall. with oil, crossed their ceremonial senior of the guards, his speaking orifice framing with difficulty the "It seems to me that we need no wordy assurances from each other," said Crownwall, and he Crownwall. "I want to see Ffallk." just to quarantine you. When we had used your radio system there, but I doubt it." "Just tell him that a man has arrived from Earth to talk to him. He'll summon me fast enough. Meanwhile, my highly polished Crownwall sat on the steps, trying to present an air of strolling nonchalance. He gestured fluidly with a graceful tentacle. "You!" he said to Crownwall. "Follow me. His Effulgence commands you to appear before him at once." The two Crownwall stamped out his After several minutes of silent consideration, "It is an excellent plan," said His Effulgence. "It is why we cannot proceed with our discussions." "Nor do I," consented Crownwall. Vegan in lordly trappings. They examined Crownwall with "I'm afraid that Ggaran had expected to take what you Earthlings have to offer without giving such ideas. I have not underestimated you, you see." "That's nice," said Crownwall Crownwall to still Crownwall's immediate possible," he said. "It was only decided yesterday, back on Earth, that I would be the one to make the trip here. Even if you could indicate how we can make use of it, along with you—enough to allow After due consideration, Crownwall nodded. "I don't Earthling from another? What I meant was that I expected someone from Earth to break through our blockade and come here. Most of my advisors—even Ggaran here—thought it couldn't be done, but I never doubted that you'd manage take over number one spot from Crownwall. "If you wanted someone from Earth to come here to see to Crownwall. "If you couldn't Earth as the spatial referent, I am the leader of one of the mightiest peoples in the Galaxy, of which ours is such a distinguished member. whereas there are scarcely six "Then of course, as I continued "I'm listening," said Crownwall. "We offer you partnership with us to take over the rule of the Master Race." "It would hardly be an equal it was really very simple. "And there's no danger of meeting "Are you sure that you haven't given us a little too much information for your own safety?" asked Crownwall shrugged. "So?" "Excellent," said Ffallk. "I'd better escort you They showed many signs of an ability to reason, but a complete cohort of troops, pikes at the ready and bows strapped to their backs, leaped forward and formed a be numbered among the Servants of the Emperor. So we let you alone, in order that you could develop in your own way, until you reached a high enough civilization least, as Ambassador, you can ride "I'm glad of that," said Crownwall. "You Earthlings, in defiance of Crownwall. "I was course," he added, bowing slightly to Crownwall. "Of course," agreed Crownwall, doesn't hear your trumpeters, or something like that?" Ggaran stepped forward, already in space, about forty thousand kilometers above the Earth. It had been manned by a dozen adventurous people, captained by Crownwall, and had headed out on its ion after His Effulgence's entourage arrived." He turned to one of the The men of Earth had decided that it should work in theory. They never dared to try it, close to a with civilians who violate this particular tradition." His Effulgence beckoned to the bowman to approach. "Your results were satisfactory," he said, "but planet. To do so, said their theory, would usually—seven point three and spoke again to Crownwall. had headed for that planet confidently and unsuspectingly, using the ion drive. "Of course," said Crownwall, Although caught by surprise, the Earthmen had acted swiftly. Crownwall recalled the discussion—the Crownwall. as they had departed. Earth had immediately prepared for war to His Effulgence and to Crownwall during the trip, without interrupting the smooth progress they had returned to Earth as swiftly continued to run—without food, danger." of fatigue. After several hours of travel, following Crownwall's directions, the Ffallk rippled in agreement. "The action you took was too swift drink or, except for Ggaran, evidence my own race who manned them. We had tried to contact you, but since you had not developed subspace than the height of folly. It was madness." Crownwall climbed into his "Could we have done anything landing on Earth and taking us over?" asked Crownwall. "Would that have been so bad?" starting his enormous journey through time back to Earth. More quickly than it had taken him to said Ggaran. "We can't tolerate Government of Earth, making a full report on his trip to Vega. When he had finished, the President send ambassadors, you had already organized a not inconsiderable defense. send them down to your planet. obvious that we could not conquer you. We could only destroy you." "That old fool on Sunda, the Emperor, decided that we should blow you up, but by that time I had decided," said His Effulgence, "that you might be useful to me—that is, that we might be useful to each other. I traveled halfway across the Galaxy to meet him, to or two. Before I came in here, I asked Marshall to take the ship out and check on things. He should be convince him that it would be sufficient surprised if we didn't find a change back with his report before long. Why don't we wait and see what he has to say?" we had done our job. "With his usual lack of imagination, he felt sure that we were safe from you—after all, there was no way for you to get off the planet. Marshall largest of your oceans, he figured Crownwall. "Our enemies are all show up on our planet. So I've been waiting for you, and here you are." "Alone," he said, and unconsciously repeated Marshall's words: "It was the thinking of a genius," am," said Crownwall. "So what's murmured Ggaran. room, leaving Crownwall sitting at "We're all alone now." involuntarily, and then leaped to his feet to follow after them. Loneliness, he found, was something that he couldn't face alone. —L. J. STECHER, JR. among the stars, and we helped them develop to the point where, in their inferior way, they were able "For more than two million years we have waited for the opportunity opportunity is at hand." "If you haven't been able to help yourselves for two million years," asked Crownwall, "how does the at a soothing wave from His Effulgence. "War in space is almost an impossibility," said the aged ruler.

<question>:
Why is Crownwall the representative from Earth sent to Vega?

<options>:
A He was the only one who was willing to undergo the time travel procedure
B He was the only one without connections on Earth, making it easier for him to take time away
C He was the default choice once the humans determined that Marshall was not fit for the job
D He was a reasonable option given his prior leadership experience on missions

<answer>:

D