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

<passage>:
perhaps. He could smell the bitter fragrance of tobacco smoke mingling with disapproval. He turned his head slightly so he could just see Eckert in the bank 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 because, at one time or another, they had had to. It was Eckert who had come into his office several days ago and told Eckert had come into his office without saying a word and had watched making a simple pattern drifting past the glass. Eckert had fiddled He shouldn't get sentimental. But how the hell else should he remember had come of good stock. There had been no mental instability in his family for as far back as the genetic records went. He had been raised the Diplomatic Service, his grades had improved. He had worked hard at 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 had been elected president of that, he had graduated with such and such honors. But try getting a picture of him by reading the records, resurrect him from a page of black print. Would he be human? Would he be flesh and blood? Hell, no! In the statistics Pendleton was the 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 be born. Parents would get them by sending in so many box tops. He was drowsy the ceiling told how close they were to takeoff. His head was thick with drowsiness, his eyelids a heavy weight that he knew he couldn't keep open much longer. But that wasn't the real reason. Maybe Eckert thought so, but he knew The thin red line was practically microscopic now and Templin could feel his lashes lying gently on his cheeks. But he wasn't asleep—not committed suicide not long after landing." The room was a whirling pool of blackness into which his mind was alive." Warm breezes rustled through Eckert's graying hair and tugged gently at his tunic. The air smelled as if it had been washed and faintly It won't be long before it will be green again , he thought. The grass looked as though it grew fast—it would certainly have plenty of time to grow before the next ship landed. He looked at the slim, dwindling shape that was the rocket, and was up. He stood there for a moment, drinking in the fresh air and feeling the at that, away from the din and the hustle and confusion, spending the time in a place where the sun was warm and inviting. I must be getting old , he thought, thinking about the warmth and comfort. Like old dogs and octogenarians. Templin was looking at the scenery with a disappointed expression on 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 seem cluttered or dirty and you didn't feel like beating a hasty retreat when the wind was blowing toward you. A few adults were watching them curiously and the usual bunch of Eckert stared at them for a moment, wondering what it was that seemed odd about them, and they stared back with all the alert dignity of childhood. They finally came out on the field and clustered around him and Templin. Templin studied them warily. "Better watch them, Ted. Even kids can be But the idea still didn't go with the warm sun and the blue sky and the piny scent of the trees. One of the adults of the village started to walk toward them. "I'd be very careful what I did," Eckert said softly. "I would hate to start something merely because I misunderstood their intentions." The committee of one was a middle-aged man dressed in a simple strip of white cloth twisted about his waist and allowed to hang freely to his knees. When he got closer, Eckert became less sure of his age. He had the firm, tanned musculature of a much younger man, though a slightly 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 and then offered his hand, somewhat shyly, Eckert thought, in the furnished, in a rustic sort of way, and what modern conveniences they didn't have they could easily do without. The youngsters who had carried their luggage left it outside and quietly faded away. It was getting dark Eckert opened one of the boxes they had brought along, Eckert shrugged. "That's one of the things you do out of habit, try "That's not very typical of a primitive society, is it?" "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?" "Too healthy," Templin said. "There didn't seem to be any sick ones or ones with runny noses or cuts or black eyes or bruises. It doesn't seem natural." "They're probably just well brought-up kids," Eckert said sharply. "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 times before. It should still be a novelty to them. And yet how much curiosity did they show? Hardly any. Was there any fear? No. And the cute, harmless little kids." He looked at Eckert. "Maybe that's what He was keyed up, jumpy, Eckert realized. He would probably be seeing wood slat blinds, carrying the fragrance of the trees and the grass, and he inhaled deeply and let his thoughts wander for a moment. It was power pack, Eckert saw grimly, probably leading to the buttons on his Eckert put down the chain he had been whittling and reached for his seemed likely to turn into a vendettist. It meant that Eckert would Eckert rolled up the thin, slatted blinds and stared out at the "Physically perfect, like the men," Templin grumbled. "You could get an inferiority complex just from watching the people here. Everybody's so 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 voice was crisp. "I knew Don Pendleton quite well, too," he said. "But 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 enjoy himself, but there was still a slight bulge under his tunic, "You look thoughtful, menshar 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 Eckert stared bleakly at his wine glass and tried to put the pieces of . He glanced across the circle at Templin. Templin's face—what he could see of it by the flickering light—was brick red.

<question>:
Why did Eckert think that one would have to view the committee member's teeth to know his age?

<options>:
A He seemed wise beyond his years.
B He had disguised himself as an old man with gray hair but no wrinkles.
C He acted too much like a small child.
D He looked both young and old at the same time.

<answer>:

D