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

<passage>:
There were a hundred and seven men, women and children. With no design on my part, they tended to segregate into groups consisting of four to eight couples together with the current children of the women. Within these groups, the adults were promiscuous, but apparently not outside the group. The group thus had the appearance of a super-family and the males indulged and cared for all the children without reference to actual parenthood. Cosmos has a really nasty sense of humor! The only kind of gag worth pulling, I always maintained, was a cosmic one—till I learned the By the end of the week, these super-families were scattered over about four square miles of the ranch. They had found a new delicacy, the U.S. copyright on this publication was renewed.] sparrows, and hunted them easily as they roosted at night. I had taught houses in which the young, and sometimes the adults, slept through midday and midnight. tolerantly. "Can't adjust your skates?" I asked again. "Daddy, I've tried and tried and I just can't turn this old key tight Extensive research did not uncover any evidence that "Well, Dad-dee, I can't!" "What?" "You can't turn this old key tightly enough." My son asked, "What happened to the animals?" "Turned them over to the university for further study," I lied. "Well," he said to her, "you can't say our pop isn't a man of decision." twelve. I glanced across the animal room to where old Nijinsky thrust his graying head from a cage. I had called them volplas since the day old Nijinsky's elongated arms and his cousin's lateral skin folds had given me the idea of a flying mutant. hands, four times as long as the others, uncurled as he spun about the cage. "Daddy?" "Yes?" "Mother says you are eccentric. Is that true?" "I'll speak to her about it." "Don't you ?" "No." mother that I retaliate. I say The accelerator had forced them almost to adulthood in less than a month. It would be several hours before they would begin to move, to learn to feed and play, perhaps to learn to fly. Meanwhile, it was clear that here was no war of dominant mutations. Modulating alleles had smoothed the freakish into a beautiful pattern. when I slipped out. "Come on, you old hermit. I have a buffet on the terrace." "Our daughter says I'm eccentric. Wonder how the devil she found out." "From me, of course." "But you love me just the same." I wiped the back of my hand across my mouth and said aloud, "Yes, sir, the dangerous age. And, lady, I'm going to have fun." My wife sighed patiently. boy unsaddle the horse and slap it away to the pasture. I thought, "By God, wouldn't he have a fit if he knew what I have back there in that lab! Wouldn't they all!" The boy carried the saddle up onto the terrace and dropped it. "Mom, Mother . Why?" "Because, dear, I said so." "Is that any reason for wearing clothes? Look at him. He's a young man sooner than already." "Well, if you feel that way about it, they'll both have to start wearing clothes." I gulped the last of my hamburger and washed it down with the beer. "This place is going to hell," I complained. "The old man isn't allowed "I told you—" "Oh, not that again! You were dangerous at any age." "It's a joke," I assured her. "I'm going to play a tremendous joke on but I've always...." to stand around quietly and watch people encounter the surprise that you have prepared for them." eccentric ?" I grinned. "Forgive me if I eat and run, dear. Something in the lab can't wait." stand. He was a little the larger and stood twenty-eight inches high. Except for the face, chest and belly, they were covered with a soft, almost that the eyes were large and nocturnal. The cranium was in the same proportion to the body as it is in the human. the spars closed, they were holding little cups and drinking water from them in a most humanlike way. They were active, curious, playful and decidedly amorous. Their humanoid qualities were increasingly apparent. There was a lumbar curvature and buttocks. The shoulder girdle and pectoral muscles were I danced a little jig the way old Nijinsky might do it. "Oh, great! Oh, wonderful! Good old Guy! Everybody's a success. It's great. It's wonderful. Success on success!" anyone suspected. One day, somebody would see a volpla. The newspapers would laugh. Then someone authoritative would find a colony and observe them. He would conclude, "I am convinced that they have a language and speak it intelligently." The government would issue denials. Reporters would "expose the truth" and ask, "Where have these aliens come from?" The government would reluctantly admit the facts. Linguists would observe at close quarters and learn the simple volpla language. Then would come the legends. Volpla wisdom would become a cult—and of all forms of comedy, cults, I think, are the funniest. "Darling, are you listening to me?" my wife asked with impatient "What? Sure. Certainly." "What broadcast?" "For heaven's sake, darling," my wife complained, "I told you about himself explaining that when he pressed the button before him, the "Darling, will you please—be— ?" "Yeah, Dad. Can it, will you? You're always gagging around." I heard my boy whisper, "Uncle Guy, this is the biggest!" it's always been pictured. A mechanical voice cut in. infants were females, which sped things up considerably. the opportunity to slip the oldest of the males and his two females out They were all three wide-eyed at the world and jabbered continuously. playful curiosity about the world had been abandoned momentarily and he was chasing one of the girls. As usual, she was anxious to be caught so that I could not get near. Suddenly he laughed with a shrill little whoop. After that, it was a carnival. They learned quickly and brilliantly. They were not fliers they were I watched them affectionately and wondered about the advisability of leaving them out here. Well, it had to be done sometime. Nothing I ground, the wrists crossed at his chest. He spoke first. "You lived in places like this all along these mountains. Now there are very few of you left. Since you have been staying at my place, you naturally have forgotten the ways of living outdoors." "We can learn again. We want to stay here." His little face was so "Chances are they won't stay long. Keep your eye on the tree in case wonderingly, stopping now and then to watch him. When they were standing beside me, they said nothing. They shaded their eyes with tiny hands and watched him as he passed directly above us at about two him. Their lavish affection held him up for a time, but eventually he strutted in like every human hunter. They were raptly curious about the bird. They poked at it, marveled at its feathers and danced about it in an embryonic rite of the hunt. But gleeful and greasily amorous during the meal. When I had to leave, it was dark. I warned them to stand watches, keep "I promise." He looked up at the night sky and, in the firelight, I saw his wonder. "You say we came from there?" "The old ones of your kind told me so. Didn't they tell you?" "I can't remember any old ones. You tell me." "That's right."

<question>:
Why does the narrator lie to his son?

<options>:
A Even though his son is a young man sooner than already, he is still too young to learn the full scope of the truth.
B A joke stops working when someone attempts to explain it.
C For his joke to have its desired effect, no one can know the full extent of his experiment.
D He is an eccentric and must abide by his personal eccentricities.

<answer>:

C