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

<passage>:
Tr'en were an efficient people. All the preliminary reports had agreed Korvin's arrival a necessity. They were well into the atomic era, and settling the other planets of their system, and then the nearer stars. efficient physical scientists of the Tr'en—and that would mean, in the ordinary course of events, an invitation to join the Comity of An invitation, the Comity was sure, which the Tr'en would not accept. Korvin stretched out on the cell's single bunk, a rigid affair which to the wonder and amazement of his Tr'en captors. that the Tr'en had seen fit to give him a pack of cards, or a book, or even a folder of tourist pictures. The Wonders of Tr'en, according to would at least have been other prisoners to talk to. But on Tr'en lesson in the local language, but Korvin failed to get much pleasure at the walls. The Tr'en were efficient The Tr'en was tall, and slightly green. He looked, as all the Tr'en did, vaguely humanoid—that is, if you don't bother to examine him closely. Life in the universe appeared to be rigidly limited to humanoid types on oxygen planets Korvin didn't The Tr'en regarded him narrowly through catlike pupils. "You are It was a ritual, Korvin had learned. "You are of the Tr'en," he the door behind him. Korvin thought of jumping the Tr'en, but decided "What do you want with me?" Korvin said. The Tr'en speech—apparently dealt with back on Earth, in training but it was more closely and carefully constructed than even those marvels. Korvin sighed. "What are you doing here, then?" he asked. As to get the hang of, Korvin told himself bitterly. He thought for a that was a general word in the Tr'en language, reference. "Why did the Ruler not come to me?" Korvin asked. Korvin shrugged, sighed and smoothed back his hair. "I obey the But Korvin meant exactly what he'd said. He was going to obey the commands of the Ruler of the Tr'en—and remove the Tr'en threat from contrast of the Tr'en themselves were figured in. table near him, staring at Korvin and his guards. The guards stood on The Tr'en liked to have everything clear. They were a logical race. The Ruler had started with Korvin's race, his name, his sex—if any—and whether or not his appearance were normal for humanity. Korvin shrugged. "Some are over eight feet tall," he said, "and others under four feet." He used the Tr'en measurement scale, of course Korvin nodded hurriedly. "Our race is more ... more approximate," he went on. "Why?" Korvin shrugged again. "What I say is true," he announced. "Do you have tests for such matters?" "We do," the Ruler told him. "We are an exact and a scientific race. A machine for the testing of truth has been adjusted to your physiology. It will be attached to you." technicians. It was large and squat and metallic, and it had wheels, dials, blinking lights, tubes and wires, and a seat with armrests and himself marveling again at this race. Earth science had nothing to match their enormous command of the physical universe adapting a The Tr'en, under other circumstances, would have been a valuable addition to the Comity of Nations. Being what they were, though, they could only be a menace. And job—not to mention the strongest personal inclinations—demanded most to him. But, after all, the Tr'en knew their business, better than ship crashed?" The Tr'en word, of course, wasn't "Do not try to trick us we are a logical and scientific race! Answer correctly." Korvin shrugged. "I replied to your question," he said. "I did not logic"—the Tr'en word seemed to mean Korvin The experts in logic arrived shortly, and in no uncertain terms Korvin were so much primer material for the Tr'en. "They can be treated Korvin thinly. "Of course, you would not understand the mathematics. "Naturally," Korvin said in a friendly tone. "To answer your questions, truthfully and logically," Korvin said. Korvin was very glad that wasn't a question. It was, after all, the the experts were clustered around the single chair. Korvin was still strapped to the machine a logical race makes use of a traitor, but a logical race does not trust him. "It has no name," Korvin said truthfully. The Tr'en idiom was like the "I do," Korvin said, "for convenience." "We will wish to know about weapons," the Ruler said, "and about plans and fortifications. But we must first know of the manner of decision on this planet. Is your planet joined with others in a government or system. Is it the system you mean?" Very sharp, Korvin told himself grimly. "It is," he said. "Then the government which reigns over several planets is supreme," The key question had, at last, been asked. Korvin felt grateful that the logical Tr'en had determined to begin from the beginning, instead "The answer to that question," Korvin said, "cannot be given to you." "Any question of fact has an answer," the Ruler snapped. "A paradox is not involved here a government exists, and some being is the governor. Perhaps several beings share this task perhaps machines do the work. But where there is a government, there is a governor. Is Korvin shrugged. "The explanation cannot be given to you." Korvin. "Is the deficiency in you?" he said. "Are you in some way unable to describe this government?" Korvin noticed that the Tr'en were becoming slightly puzzled Korvin tried to look grateful. "Well, then," he said, "what is your government?" The Ruler beckoned to a heavy-set green being, who stepped forward from a knot of Tr'en, inclined his head in Korvin's direction, and began. "Our government is the only logical form of government," he said in a high, sweet tenor. "The Ruler orders all, and his subjects obey. In this way uniformity is gained, and this uniformity aids in in this way we are assured of a common wisdom and a steady judgment." "You have heard our government defined," the Ruler said. "Now, you will define yours for us." "None," Korvin said. Korvin nodded. "Yes." Korvin shrugged. "Not knowingly," he said. The Ruler flashed a look at "Ah," the Ruler said suddenly, as if he saw daylight ahead. "And why not?" "We call our form of government democracy ," Korvin said. "It means the rule of the people. There is no need for another ruler." One of the experts piped up suddenly. "The beings themselves rule each other?" he said. "This is clearly impossible force, there can be no effective rule." "That is our form of government," Korvin said. "You are lying," the expert said. One of the technicians chimed in: "The machine tells us—" Korvin wondered, as the technicians argued, how long they'd take Korvin found himself the object of more attention than he had hoped Korvin thanked his lucky stars that their genius had been restricted to the physical and mathematical. Any insight at all into the mental sciences would have given them the key to his existence, and his particular plan. That, and the political structure of the Tr'en. The same lack of insight let the Tr'en subconscious work on his the Tr'en aren't about to come you've got to be democratic, to some extent, to understand the idea. What keeps us obeying laws we ourselves make? What keeps us obeying laws that make things inconvenient for us? Sheer self-interest, of course—but try to make a Tr'en see it! With one government and one language, they just weren't equipped for translation. They were too efficient physically to try for the mental sciences at all. No mental sciences, no insight into my mind or their own—and that means no

<question>:
What were the topics of the Tr'en's questions to Korvin about Earth?

<options>:
A human physiology, weapons, space travel, government
B human physiology, weapons, name, location, space travel, government
C human physiology, weapons, name, location, government
D human physiology, weapons, government

<answer>:

C