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 cell had been put together more efficiently than any Korvin had 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 magic, several miles away near the slightly-damaged hulk of his ship, 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 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 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 know why, and neither did anybody else. There were a lot of theories, but none that accounted for all the facts satisfactorily. Korvin Korvin," he said. 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 "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 it was the across. It reminded him of some of the mathematical metalanguages he'd dealt with back on Earth, in training but it was more closely and Korvin sighed. "What are you doing here, then?" he asked. As to get the hang of, Korvin told himself bitterly. He thought for a 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 But Korvin meant exactly what he'd said. He was going to obey the 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 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. Korvin shrugged. "Some are over eight feet tall," he said, "and others under four feet." He used the Tr'en measurement scale, of course it didn't seem necessary, though, to mention that both extremes of height ," he volunteered helpfully. "Approximately?" the Ruler growled. "We ask for precision here," he said. "We are scientific men. We are exact." Korvin nodded hurriedly. "Our race is more ... more approximate," he said apologetically. for you." "You will answer my questions," the Ruler said, "with exactitude." He paused, frowning slightly. "You landed your ship on this planet," he went on. "Why?" Korvin looked around and saw it coming through the door, pushed by two 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 hypnopædic language-course to an alien being so quickly had been Korvin's appreciation of the size of that menace was growing hourly. him telling an untruth, he wasn't likely to live long, and his Korvin swallowed again. The test hadn't really seemed extensive enough anyone else could know it. They had the technique and the logic and the training. He hoped they were right. The Ruler was frowning at him. Korvin did his best to look receptive. "Why did you land your ship on this planet?" the Ruler said. "My job required it," Korvin said. Korvin looked sober. "Yes," he said. Korvin decided to throw his first spoke into the wheel. "Staying 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 Korvin shrugged. "I replied to your question," he said. "I did not Korvin's guards were standing around doing nothing of importance now The Ruler looked down at Korvin. "You will find that you cannot trick Korvin Korvin devoutly hoped so. The experts in logic arrived shortly, and in no uncertain terms Korvin 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 The expert frowned horribly, showing all of his teeth. Korvin did his Korvin was very glad that wasn't a question. It was, after all, the only logical deduction. But it happened to be wrong. "The name of your planet is Earth?" the Ruler asked. A few minutes had passed the experts were clustered around the single chair. Korvin was "It has other names?" the Ruler said. "It has no name," Korvin said truthfully. The Tr'en idiom was like the Earthly one and certainly a planet had no name. People attached names to it, that was all. It had none of its own. "Yet you call it Earth?" the Ruler said. "I do," Korvin said, "for convenience." "Do you know its location?" the Ruler said. "Not with exactitude," Korvin said. There was a stir. "But you can find it again," the Ruler said. Korvin nearly smiled. "Both," he said. The key question had, at last, been asked. Korvin felt grateful that it saved a lot of time. "The answer to that question," Korvin said, "cannot be given to you." Korvin shrugged. "The explanation cannot be given to you." Korvin. "Is the deficiency in you?" he said. "Are you in some way Korvin noticed that the Tr'en were becoming slightly puzzled Korvin shook his head earnestly. "I am attempting," he said, "not to Korvin shook his head. "If you insist," he said, "I'll try it. But you Korvin shrugged. "Not knowingly," he said. The Ruler flashed a look at 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. "We have no need of one," Korvin said calmly. 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 On the third day Korvin escaped. 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 quite intent, Korvin was sure. Getting to the ship was a little more space-borne, inside of a few hours after leaving the cell. 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

<question>:
What was the main reason Korvin did not try to escape earlier?

<options>:
A He needed to accomplish his mission before he left
B His ship had crashed
C He was afraid of being killed
D He did not know the exact location of Earth

<answer>:

A