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

<passage>:
Maitland felt his face become hot. "Men can go anywhere, if they want To the men of the future, the scientific goals of today were as incomprehensible Despite his sudden irrational anger toward her, Maitland tried to stick There was a thump. Maitland stirred, came half awake, and opened his Something moved in the darkness on the other side of the room. Maitland beneath its leafy roof of huge ancient trees. Shock contracted Maitland's diaphragm and spread through his body. His breathing quickened. Now Where was he? Who had brought him here? For what purpose? He thought he knew the answer to the last of those questions. As a member of the original atomic reaction-motor team, he possessed information that other military powers would very much like to obtain. It was absolutely incredible that anyone had managed to abduct him from the heavily guarded confines of the Reservation, yet someone had done it. How? the details, he had the impression that there was something wrong the Age of Technology. Everybody was terribly excited about what could be done with machines—machines to blow up a city all at once, or fly about it. To begin with, the style was unfamiliar. There were no way I feel. Listen, Bob." She laid a hand on his arm. "You grew up in "Because this is the Age of Man the door slid aside and disappeared. Maitland glanced in at Maitland stared at her, his face blank. His mind had just manufactured Maitland looked up at the girl, who was regarding him silently with Maitland speculated on the possibility that this might be Sweden As they came closer, he saw that both of them had dark uniform suntans and showed striking muscular development, like persons who had trained sandals, stood across the threshold looking in at him. Maitland stood The fellow looked about forty-five. The first details Maitland noticed were the forehead, which was quite broad, and the calm, clear eyes. The dark hair, white at the temples, was combed back, still damp from swimming. Below, there was a wide mouth and a firm, rounded chin. This man was intelligent, Maitland decided, and extremely sure of himself. Somehow, the face didn't go with the rest of him. The man had the head of a thinker, the body of a trained athlete—an unusual combination. you are. I am not going to tell you." He had an accent, European, but otherwise unidentifiable. Possibly German. Maitland opened his mouth any way, provided you cooperate. And you can forget the silly idea that we want your childish secrets about rocket motors." Maitland's heart jumped. "My reason for bringing you here is altogether different. I want to give you some psychological tests...." "Are you crazy?" Maitland asked quietly. "Do you realize that at this "What's the idea?" Maitland asked. "What is all this?" Maitland stood there for a moment, deliberately relaxing his tensed muscles. "Make me." If Swarts was irritated, he didn't show it. "That was the first test," Maitland shook his head stubbornly. He moved so fast that Maitland couldn't block the blow. It was to the the others. So—Maitland thought—Swarts could record changes in his skin potential, heartbeat, and blood pressure: the involuntary responses of the body to stimuli. The question was, what were the stimuli to be? "Your name," said Swarts, "is Robert Lee Maitland. You are thirty-four years old. You are an engineer, specialty heat transfer, particularly as applied to rocket motors.... No, Mr. Maitland, I'm not going to question you about your work "You seem to know everything about me," Maitland said defiantly, ?" Something eager leaped in Maitland's breast at the abrupt question, and he tried to turn his head. Then he forced himself to relax. "What do you mean?" didn't I? Maitland, I brought you here because you're a man who wants expectancy. Maitland sighed and said, "Hello," then glanced down and to think. There were three questions for which he required answers before he could formulate any plan or policy. Where was he? Who was Swarts? What was the purpose of the "tests" he was being given? It was possible, of course, that this was all an elaborate scheme for getting military secrets, despite Swarts' protestations to the contrary. Maitland frowned. This place certainly didn't have the Maitland felt his worry drain away, leaving an almost mystical sense of have to worry any more about military secrets, or who Swarts was. Those questions were irrelevant now. And now he could accept the psychological tests at their face value most likely, they were what his life among the planets, a citizen of deep space, a voyager of the challenging spaceways between the solar worlds. "I'm adaptable," he told himself gleefully. "I can learn fast. There'll be a job for me out there...." If— After a while Maitland smiled to himself and went back to bed. Swarts came half an hour later, and Maitland began his planned Wordlessly, Maitland climbed to his feet, preceded Swarts to the 3 x dx" in his head. It was a calculation which required great concentration and frequent "What year is this?" Maitland asked in a conversational tone. "We'll try another series of tests." It took Swarts nearly twenty minutes to set up the new apparatus. He of a binocular microscope over Maitland's head, so that the lenses at eyes. He attached tiny clamps to Maitland's eyelashes. He inserted button earphones into Maitland's ears— With a deliberate effort, Maitland unclenched his fists and tried to slow his breathing. Some kind of emotional reaction test—what was the countermove? He closed his eyes, but shortly the muscles around them declared excruciatingly that they couldn't keep that up. Maitland gritted his teeth and fought to use his brain then he had it. after school. He remembered a talk he had heard by a politician who had all the intelligent social responsibility of a rogue gorilla, but no more. He brooded over the damnable stupidity and short-sightedness of Swarts in standing by his silly rules and not telling him about this new world. There was blood hammering in Maitland's temples. His face felt hot and eyes and Swarts was standing over him, white-lipped. Maitland swore at Maitland's smile became a grin. Maitland urged her into the chair and sat down on the edge of the bed. "How do you mean—" Maitland wrinkled his brow—"adapt to modern culture? Don't tell me His fear that she would be offended proved to be completely one of his great-grandfathers was pure-blooded Bantu. His full name is Lassisi Swarts." Maitland wrinkled his brow. "Afrikander?" Afrikanders had been partly isolated for several centuries then, and they had developed technology while the rest of the world lost it. They had a tradition of white supremacy, and in addition they were terrified That went into the history books as the War of Annihilation." "So many? How?" "They were clever with machines, the Afrikanders. They made armies of them. Armies of invincible killing-machines, produced in robot factories from robot-mined ores.... Very clever." She gave a little shudder. "And yet they founded modern civilization," she added. "The grandsons of the technicians who built the Machine Army set up our robot production system, and today no human being has to dirty his hands raising food or manufacturing things. It could never have been done, She shook her head, bewildered. "I always thought that would be a tough problem to crack," he agreed. After several seconds, Maitland swallowed. Something seemed to be the matter with his throat, making it difficult for him to speak. "Surely you have space travel?"

<question>:
Why does Maitland suspect that he was taken?

<options>:
A His kidnappers had wrongly thought of him as a rich person
B He was representative of the location he was kidnapped from and needed to speak for his community
C He was found out as an American spy
D Because he had special knowledge of engine mechanics

<answer>:

D