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

<passage>:
Volpla That next week, I transported all of the volplas out to the oak woods. males indulged and cared for all the children without reference to actual parenthood. By the end of the week, these super-families were scattered over the volplas to use the fire drill and they were already utilizing the local grasses, vines and brush to build marvelously contrived tree houses in which the young, and sometimes the adults, slept through midday and midnight. The afternoon my family returned home, I had a crew of workmen out tearing down the animal rooms and lab building. The caretakers nothing around that might connect the sudden appearance of the volplas volplas only a few more weeks to learn their means of survival and Twenty-four hours later, there wasn't a sign of animal experimentation on the ranch. Except, of course, that the woods were full of volplas. At night, I could hear them faintly when I sat out on the terrace. As they passed through the dark overhead, they chattered and laughed and sometimes moaned in winged love. One night a flight of them soared slowly across his graying head from a cage. I had called them volplas since the day the face of the full Moon, but I was the only one who noticed. Volplas at last. Three of them. Yet I had always been so sure I could withdrew the intravenous needles from my first volplas. I carried their "Lunch, dear." "Be right there." She peeked too, as she had for fifteen years, but I blocked her view when I slipped out. "Come on, you old hermit. I have a buffet on the terrace." "Oh, good heavens!" Pacific shimmered. I thought, "All this and three volplas, too." the dangerous age. And, lady, I'm going to have fun." My wife sighed patiently. the whole world. I've only had the feeling once before in a small way, on the walk in front of the movie just as Theda Bara's matinee let out. my first volplas were shockingly humanoid. They were also much faster than had been their predecessors in organizing their nervous activity after the slumbrous explosion of that the eyes were large and nocturnal. The cranium was in the same proportion to the body as it is in the human. Suddenly, as I teased the male volpla, this happened. Cloud Nine and he wants to celebrate." I sipped at my martini and lounged in a terrace chair watching the golden evening slant across the beautiful hills of our ranch. I they had subsequently watched the first red men and then the first loose. There would be volpla colonies all up and down the Coast before anyone suspected. One day, somebody would see a volpla. The newspapers would laugh. Then someone authoritative would find a colony and observe them. He "Darling, are you listening to me?" my wife asked with impatient your TV set on?" "No," I answered. "Should I?" "It's almost time for the broadcast. I was afraid we would miss it." "What broadcast?" "From the rocket." broadcasts." As we stepped up on the terrace, she turned to Guy and Em. "He's out of contact today. Thinks he's Zeus." "Darling, will you please—be— quiet ?" "Yeah, Dad. Can it, will you? You're always gagging around." my volplas. But only for a moment. The screen returned to a studio, where an announcer explained that the map behind him. A chronometer appeared on the screen and, for several seconds, there was silence. Suddenly there was a lunar landscape on the screen, looking just as "This is Rocket Charlie saying, 'Hello, Earth,' from my position in Mare Serenitatis. First I will pan the Menelaus Mountains for fifteen seconds. Then I will focus my camera on Earth for five seconds." awesomely wild. Toward the end of the movement, the shadow of the I used the metabolic accelerator to cut the volplas' gestation down to By the next spring, I had a colony of over a hundred volplas and I shut My wife and the kids went down to Santa Barbara for a week and I took the opportunity to slip the oldest of the males and his two females out of the lab. I put them in the jeep beside me and drove to a secluded little valley about a mile back in the ranch. They were all three wide-eyed at the world and jabbered continuously. Until I had them out in the open country, it had been impossible to appreciate fully what lovely little creatures they were. They blended perfectly with the California landscape. Occasionally, when they raised Almost two hours went by before the male made it into the air. His 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 He probably meant to dive for her. But when he spread his arms, the hung in the breeze for a long moment, thirty feet above the ground. He turned a plaintive face back to me, dipped worriedly and skimmed The two girls reached him before I did and stroked and fussed over him launched themselves in beautiful glides for hundreds of feet, banking, Of course, the volplas didn't want to return to the lab. There was a "Before the red men came, did we live here?" "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 We both heard the whir of wings overhead. Two mourning doves flew He looked around slowly at the breeze playing in the branches and dancing along the hillside grass. It was as if he had been flying a there. I can stay for a while. How long will they be in the tree?" "Chances are they won't stay long. Keep your eye on the tree in case they leave while you are climbing." himself, streaked down-valley a way and caught a warm updraft on a criss-crossing the ridge, working his way back to us. wonderingly, stopping now and then to watch him. When they were standing beside me, they said nothing. They shaded their eyes with hundred and fifty feet. One of the girls, with her eyes fast on his He flashed high above the stream and hung behind the crest of the hill occurred to me they would not leave that safety while the hawklike silhouette of the volpla marred the sky so near. The birds came out of the tree, climbing hard with their graceful I looked back, as did the girl remaining beside me. The soaring volpla The doves abruptly gave up their hard climbing and fell away with swiftly beating wings. I saw one of the male volpla's planes open a The doves separated and began to zigzag down the valley. The volpla did lower than the bird he was after, then swept up and intercepted the bird's crossward flight. I saw the planes close momentarily. Then they opened again and the bird plummeted to a hillside. The volpla landed gently atop the hill and The volpla beside me danced up and down shrieking in a language all her Later, I shared a small piece of the meat in their feast. They were gleeful and greasily amorous during the meal. When I had to leave, it was dark. I warned them to stand watches, keep the fire burning low and take to the tree above if anything approached. The male walked a little away with me when I left the fire. here in this woods until they're ready to leave." "I promise." He looked up at the night sky and, in the firelight, I saw Sunday supplements that would be written in about a year, maybe even less. He looked into the sky for a long time. "Those little lights are the stars?" "That's right."

<question>:
Why is the narrator the only one who notices a flight of volplas soaring slowly across the full Moon?

<options>:
A Because volplas are fictional creatures and people do not believe they exist.
B Because other witness believe this was ET with  a little boy riding his bicycle over the moon.
C Because people generally only notice what they look for and would dismiss the phenomenon as something else.
D Because it is nighttime and everyone is indoors.

<answer>:

C