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

<passage>:
[Transcriber's Note: This etext was produced from They were all excellent, Eckert thought. If anything, they were too Nothing could have seemed pleasanter than that peaceful planet. Then why was a non-suicidal Eckert, you have but to ask." the gas. Eckert had lit a cigarette and was calmly blowing the smoke facing him. Eckert, one of the good gray men in the Service. The old reliables, the ones who could take almost anything in their stride It was Eckert who had come into his office several days ago and told Only Pendleton wasn't the type. He was the kind who have everything to live for, the kind you instinctively know will amount to something Eckert was just a dull, formless blur opposite him. His cigarette was Eckert had come into his office without saying a word and had watched it, though he wasn't what you would call a grind. In high school and later in college, he was the well-balanced type, athletic, popular, hard-working. How long would it be before memories faded and all there was left All-Around Boy, the cold marble statue with the finely chiseled muscles and the smooth, blank sockets where the eyes should be. Maybe someday fate would play a trick on a hero-worshiping public and there would Eckert and he had been chosen to go to Tunpesh and investigate. The two But that wasn't the real reason. Maybe Eckert thought so, but he knew "It's a nice day, isn't it, Ted?" Eckert took a deep and pleasurable Warm breezes rustled through Eckert's graying hair and tugged gently inviting, and brilliantly colored birds whirled and fluttered in the foliage. , he thought, thinking about the warmth and comfort. Like old dogs and octogenarians. his face. Eckert stole a side glance at him and for a fleeting moment Eckert nodded agreement. "It wouldn't fit, would it? It would be like a It looked fairly primitive, Eckert thought, and yet it didn't have the Eckert stared at them for a moment, wondering what it was that seemed dangerous." It's because you never suspect kids , Eckert thought, "I'd be very careful what I did," Eckert said softly. "I would hate to knees. When he got closer, Eckert became less sure of his age. He had seamed face and white hair aged him somewhat. Eckert still had the feeling that if you wanted to know his exact age, you'd have to look at his teeth or know something about his epiphyseal closures. "You are the pronunciation was very clear. Eckert regarded him thoughtfully and made a few mental notes. He wasn't bowing and scraping like most and then offered his hand, somewhat shyly, Eckert thought, in the He was polite, Eckert thought. He didn't ask what they were there Eckert and Templin took a quick tour of the few rooms. They were well Eckert opened one of the boxes they had brought along, "You've been very kind to us and we would like to repay you. You may take what you wish of anything within this box." He opened another of the light. Eckert knew by the way he looked at it that he wasn't at all Eckert shrugged. "That's one of the things you do out of habit, try nothing that he wanted. Implying that everything he wanted, he already had." "No, I'm afraid it's not." Eckert started unpacking some of the boxes. "You know, Ray, I got a kick out of the kids. They're a healthy-looking lot, aren't they?" natural." "They're probably just well brought-up kids," Eckert said sharply. "Maybe they've been taught not to get in fights or play around in the "In what way?" The words came out slowly. "The people are too casual, as though they're playing a rehearsed part. Here we are, from an entirely cute, harmless little kids." He looked at Eckert. "Maybe that's what we're supposed to think—just an idyllic, harmless society. Maybe that's what Pendleton thought, right to the very end." He was keyed up, jumpy, Eckert realized. He would probably be seeing keep an open mind until we know for certain." He flicked out the light and lay back on the cool bed, letting his Eckert put down the chain he had been whittling and reached for his pipe and tobacco. "I don't think it's primitive at all. There are too many disparities. Their knowledge of a lot of things is a little more than empirical knowledge they associate the growth of crops with fertilizer and nitrogen in the soil as well as sunlight, rather than the blessings of some native god. And they differ a lot in other respects. Their art and their music are advanced. Free art exists along with purely decorative art, and their techniques are finely developed." Eckert hefted it in his palm. "The most important thing is that they "Well, what do you think about it?" "The obvious. They evidently have as much technology as they want, at least in fields where they have to have it." Eckert sighed and watched a fat bug waddle across a small patch of seemed likely to turn into a vendettist. It meant that Eckert would believe. It's more likely that his friends have been silenced and any information about him is being withheld for a reason." "What reason?" Eckert rolled up the thin, slatted blinds and stared out at the inferiority complex just from watching the people here. Everybody's so damn perfect. Nobody's sick, nobody's unhealthy, nobody is too fat or too thin, nobody's unhappy. The only variation is that they don't all look alike. Perfection. It gets boring after a while." "Does it? I hadn't noticed." Eckert turned away from the blinds. His it isn't blinding me to what I'm here for. We came to find out what happened to him, not to substantiate any preconceived notions. What we find out may be vitally important to anybody serving here in the future. I would hate to see our efforts spoiled because you've already made up your mind." suicide?" "I don't think there's such a thing as a suicide type, when you come down to it. I'm not ruling out the possibility of murder, either. I'm trying to keep an open mind." "What have we accomplished so far? What have we found out?" we'll try to live here inconspicuously and study the people and try to cultivate informants. We would get nowhere if we came barging in asking all sorts of questions. And don't forget, Ray, we're all alone on One of the hardest things to learn in a foreign culture, Eckert " " ulami and the broiled he noticed that nobody drank to excess. The old Greek ideal , he thought: moderation in everything. He looked at Templin, sitting across from him in the huge circle, and shrugged mentally. Templin looked as if he was about to break down and , Eckert thought, Eckert." Eckert took another sip of the wine and turned to the Tunpeshan on his left. He was a tall, muscular man with sharp eyes, a firm chin and a certain aura of authority. Eckert gnawed the dainty meat off a slender Eckert had a sudden clammy feeling which quickly passed away. What himself. We knew him quite well and we could not bring ourselves to believe he had done such a thing." One," he said vaguely. He didn't seem anxious to talk about it. Eckert stared bleakly at his wine glass and tried to put the pieces of information together. They probably had a taboo about self-destruction which would make it difficult to talk about. That would make it even harder for him to find out by direct questioning. limbs. Eckert felt his eyebrows crawl upward. Apparently the dance was Eckert translated as being roughly equivalent to "

<question>:
Which word least describes Eckert?

<options>:
A experienced
B observant
C nervous
D open-minded

<answer>:

C