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

<passage>:
ever been in. But that was only natural, he told himself sadly the 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 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 mind. He'd tried some of the ancient Rhine experiments, but that was 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 Korvin was all alone. there weren't even any imperfections in the smooth surface to distract him. He wasn't tired and he wasn't hungry his captors had left him with a full stock of food concentrates. But he was almightily bored, and about ready to tell anything to As he reached this dismal conclusion, the cell door opened. Korvin got 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 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 quickly against it. He was a captive, and it was unwise to assume that his captors had no more resources than the ones he saw: a small "What do you want with me?" Korvin said. The Tr'en speech—apparently 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 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 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 "A clumsy lie," the Ruler said. "The ship crashed our examinations prove that beyond any doubt." dials, blinking lights, tubes and wires, and a seat with armrests and straps. It was obviously a form of lie-detector—and Korvin felt 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 Korvin's appreciation of the size of that menace was growing hourly. He hoped the lie-detector had been adjusted correctly. If it showed him telling an untruth, he wasn't likely to live long, and his job—not to mention the strongest personal inclinations—demanded most strongly that he stay alive. The Ruler looked to his technicians for a signal, and nodded on receiving it. "You will tell an untruth now," he said. "Are you to him. But, after all, the Tr'en knew their business, better than the training. He hoped they were right. The Ruler was frowning at him. Korvin did his best to look receptive. , nor did it mean exactly that. As nearly as Korvin could make out, it meant alive." The Ruler roared. "Do not waste time with the obvious!" he shouted. "Do not try to trick us we are a logical and scientific race! Answer correctly." "I—" The Ruler stopped himself in mid-roar. "You try to confuse the Ruler," he said at last, in an approximation of his usual one. "But the Ruler will not be confused. We have experts in matters of Korvin's guards were standing around doing nothing of importance now The Ruler looked down at Korvin. "You will find that you cannot trick chulad-like Korvin translated—"attempts will get you nowhere." Korvin devoutly hoped so. The experts in logic arrived shortly, and in no uncertain terms Korvin "Naturally," Korvin said in a friendly tone. The expert frowned horribly, showing all of his teeth. Korvin did his best not to react. "Your plan is a failure," the expert said, "and you call this a good thing. You can mean only that your plan is different from the one we are occupied with." "The machine says that you tell the truth," the experts said at last, in a awed tone. "Thus, you must be a traitor to your native planet. You must want us to conquer your planet, and have come here secretly to aid us." Korvin was very glad that wasn't a question. It was, after all, the only logical deduction. But it happened to be wrong. a logical race makes use of a traitor, but a logical race does not trust him. "Sometimes," Korvin said. to it, that was all. It had none of its own. "Yet you call it Earth?" the Ruler said. the logical Tr'en had determined to begin from the beginning, instead Korvin noticed that the Tr'en were becoming slightly puzzled confuse us," he said. Korvin shook his head earnestly. "I am attempting," he said, "not to confuse you." "Then I ask for an answer," the Ruler said. from a knot of Tr'en, inclined his head in Korvin's direction, and "Many of them are unfavorable," Korvin said. "But we are not forced to accept them." expression. They needed no words the lie-detector was telling them, perfectly obviously, that he was speaking the truth. But the truth wasn't making any sense. "I told you you wouldn't understand it," he said. "It is a defect in your explanation," the Ruler almost snarled. "My explanation is as exact as it can be," he said. The Ruler breathed gustily. "Let us try something else," he said. for, no one being can have the force to compel acceptance of his commands. Without his force, there can be no effective rule." "You are lying," the expert said. One of the technicians chimed in: "The machine tells us—" "Then the machine is faulty," the expert said. "It will be corrected." Korvin wondered, as the technicians argued, how long they'd take to correct. He hoped it wasn't going to be too long he could foresee another stretch of boredom coming. And, besides, he was getting Korvin found himself the object of more attention than he had hoped one by one, the experts came to his cell, each with a different method of resolving the obvious contradictions in his statements. Some of them went away fuming. Others simply went away, puzzled. he hadn't thought it would be. Even the most logical of thinking beings has a subconscious as well as a conscious mind, and one of the ways of dealing with an insoluble problem is to 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 sciences would have given them the key to his existence, and his 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 He set his course, relaxed, and cleared his mind. He had no psionic talents, but the men at Earth Central did he couldn't receive equipped for translation. They were too efficient physically to try for the mental sciences at all. No mental sciences,

<question>:
Why did the Tr'en think that Korvin was a traitor to Earth?

<options>:
A Because he answered all of the questions truthfully.
B Because he didn't try to resist being strapped down into the lie-detector.
C Because he crashed a ship onto Tr'en thus wasting Earth's resources.
D Because they misinterpreted his positive responses to his "failure" as anti-Earth.

<answer>:

D