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 Tr'en were an efficient people. All the preliminary reports had agreed on that their efficiency, as a matter of fact, was what had made Korvin's arrival a necessity. They were well into the atomic era, and Faster-than-light travel couldn't be far away, for the magnificently efficient physical scientists of the Tr'en—and that would mean, in the ordinary course of events, an invitation to join the Comity of Planets. 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 isolation, with nothing to do but explore the resources of his own to the wonder and amazement of his Tr'en captors. He could do, as a matter of fact, precisely nothing. He wished quietly 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 all the advance reports, were likely to be pretty boring, but they'd have been better than nothing. In any decently-run jail, he told himself with indignation, there would at least have been other prisoners to talk to. But on Tr'en Korvin was all alone. discuss almost anything from philosophy to plumbing, but there was nobody to discuss it with. He changed position on the bunk and stared at the walls. The Tr'en were efficient there weren't even any As he reached this dismal conclusion, the cell door opened. Korvin got up off the bunk in a hurry and spun around to face his visitor. 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 really didn't care about it it was none of his business. The Tr'en regarded him narrowly through catlike pupils. "You are his captors had no more resources than the ones he saw: a small translucent pistollike affair in a holster at the Tr'en's side, and a "What do you want with me?" Korvin said. The Tr'en speech—apparently there was only one language on the planet—was stiff and slightly awkward, but easily enough learned under drug hypnosis most rigorously logical construction of its kind Korvin had ever come across. It reminded him of some of the mathematical metalanguages he'd dealt with back on Earth, in training Korvin sighed. "What are you doing here, then?" he asked. As than solitude. "I am leaning against the door," Didyak said. The Tr'en literalist to get the hang of, Korvin told himself bitterly. He thought for a It wasn't quite "talk" that was a general word in the Tr'en language, from, by peaceful and vocal means." Korvin filed it away for future reference. "Why did the Ruler not come to me?" Korvin asked. Korvin shrugged, sighed and smoothed back his hair. "I obey the try. 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 the rest of the galaxy forever. That, after all, was his job. Korvin decided, much too much of a bad idea, even when the color contrast of the Tr'en themselves were figured in. The Ruler himself, a Tr'en over seven feet tall and correspondingly broad, sat in the great chair, his four fingers tapping gently on the Korvin wasn't attempting to escape. He wasn't pleading with the Ruler. He wasn't defying the Ruler, either. He was just answering questions. 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. straps. It was obviously a form of lie-detector—and Korvin felt wonder enough, but adapting the perilously delicate mechanisms that necessarily made up any lie-detector machinery was almost a miracle. 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 Korvin's appreciation of the size of that menace was growing hourly. Korvin swallowed again. The test hadn't really seemed extensive enough to him. But, after all, the Tr'en knew their business, better than anyone else could know it. They had the technique and the logic and the training. Korvin shrugged. "I replied to your question," he said. "I did not the Ruler will not be confused. We have experts in matters of logic"—the Tr'en word seemed to mean right-saying —"who will advise Korvin's guards were standing around doing nothing of importance now Korvin the secretary of the club whose members were secretaries, Achilles and the tortoise, and all the other lovely paradox-models scattered around were so much primer material for the Tr'en. "They can be treated mathematically," one of the experts, a small emerald-green being, told Korvin thinly. "Of course, you would not understand the mathematics. But that is not important. You need only understand that we cannot be Korvin was very glad that wasn't a question. It was, after all, the "Sometimes," Korvin said. "It has other names?" the Ruler said. "It has no name," Korvin said truthfully. The Tr'en idiom was like the The key question had, at last, been asked. Korvin felt grateful that the logical Tr'en had determined to begin from the beginning, instead of going off after details of armament first it saved a lot of time. Korvin shrugged. "The explanation cannot be given to you." Korvin. "Is the deficiency in you?" he said. "Are you in some way "I will not," Korvin said. It was the signal for another conference. With some satisfaction, Korvin noticed that the Tr'en were becoming slightly puzzled they were no longer moving and speaking with calm assurance. 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 the speed of possible action and in the weight of action. All Tr'en "We have no need of one," Korvin said calmly. Korvin wondered, as the technicians argued, how long they'd take Korvin found himself the object of more attention than he had hoped On the third day Korvin escaped. problem was insoluble. And the Tr'en weren't capable of that sort of thinking. Korvin thanked his lucky stars that their genius had been restricted to the physical and mathematical. Any insight at all into the mental entire plan, within seconds. But, then, it was lack of that insight that had called for this particular plan. That, and the political structure of the Tr'en. The same lack of insight let the Tr'en subconscious work on his escape without any annoying distractions in the way of deep messages, but he could send them. He sent one now. Mission accomplished the Tr'en aren't about to come marauding out into space too soon. They've been given food for thought—nice indigestible food that's going to stick in their craws until they finally manage to digest it. But they you've got to be 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 is the most likely reason for Korvin's solitude in jail?

<options>:
A Solitary confinement was part of Korvin's punishment.
B There weren't any other prisoners in the jail because virtually all of the Tr'en obey the Ruler. Those who don't obey are executed.
C The Tr'en didn't want Korvin to interact with the other Tr'en prisoners because there was a chance that together they might incite an uprising.
D The Tr'en are so logical and mathematic that they don't see the need for social interaction.

<answer>:

B