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

<passage>:
vegetation. Everything else was blanketed by the sand and the powerful transportation-velocity of less than light could prevent her from visiting her "stage" in person. Therefore when she asked me to meet her at the landing field of Interstellar Voice . And then I was shaking hands with planet has developed with a supersonic method of vocal communication. The Martian speaks as the Earthman does, but he amplifies his thoughts' transmission by way of wave lengths as high as three million vibrations per second. The trouble is that by the time the average Martian reaches "But up until now this moon is the only place where it can be found. "There are two companies here," he continued, " Interstellar Voice and and yet it just crossed. "Billy-boy," she said to me in a strange voice, "look down there and tell me what you see." I followed the direction of her hand and a shock went through me from dress. Behind her strode a grizzled Earth man in a flop-brimmed hat, another Earth man, and a Martian. Detail for detail they were a duplicate of ourselves! But it wasn't a mirage. As the party came closer, we could see that their lips were moving, and their voices became audible. I listened in awe. The duplicate of myself was talking to the duplicate of Grannie Annie, and she was replying in the most natural way. Steadily the four travelers approached. Then, when a dozen yards away, they suddenly faded like a negative exposed to light and disappeared. "What do you make of it?" I said in a hushed voice. windscreen came into view. Attached to its hood was a taut wire which slanted up into the sky to connect with the kite. goggles could not conceal. ahead of us." I followed his gaze and saw a curious structure suspended between translucent gauzy material, it was. Fully two hundred cockatoos were perched upon it. They watched us with their mild eyes as we passed, but A visiphone bell sounded, and Baker walked across to the instrument. A man's face formed in the vision plate. Baker listened, said "Okay" and dropping articles into it. A pontocated glass lens, three or four Wellington radite bulbs, each with a spectroscopic filament, a small dynamo that would operate on a kite windlass, and a quantity of wire "Dang human dynamo. Got more energy than a runaway comet." A connecting door on the far side of the office opened onto a long , and through glass doors I could see clerks busy with counting machines and being packed into big cases and marked for shipment. At the far end a door to a small room stood open. Inside a young man was tilted back in a swivel chair before a complicated instrument panel. "C'mon in," he said, seeing us. "If you want a look at your friends, here they are." He flicked a stud, and the entire wall above the panel underwent a slow change of colors. Those colors whirled kaleidescopically, then coalesced into a three-dimensional scene. It was a scene of a rapidly unfolding desert country as seen from the rear of a kite car. Directly behind the windscreen, backs turned to me, directly behind them. "It's Mr. Baker's own invention," the operator said. "An improvement on the visiphone." "Do you mean to say you can follow the movements of that car and its passengers wherever it goes? Can you hear them talk too?" "Sure." The operator turned another dial, and Grannie's falsetto voice entered the room. It stopped abruptly. "The machine uses a lot of power," the operator said, "and as yet we haven't got much." The cloud of anxiety which had wrapped itself about me disappeared somewhat as I viewed this device. At least I could now keep myself we returned to Jimmy Baker's office, the visiphone bell was ringing. I went over to it and turned it on, and to my surprise the face of Antlers Park flashed on the screen. "Hello," he said in his friendly way. "I see you arrived all right. Is gave the chap an antitoxin that seems to have worked. Come to think of We exchanged a few more pleasantries, and then he rang off. In exactly an hour I went upstairs to the visiscreen room. Then once more I was directly behind my friends, listening in on their conversation. The view through the windscreen showed an irregular array top of them was stretched a translucent web. Jimmy and Grannie got out of the car and began making camp. Xartal remained in his seat. He was drawing pictures on large pieces of pasteboard, and as I stood there in the visiscreen room, I watched him. group of Earth people suddenly materialized on the eyrie, talking and moving about as if it were the most natural thing in the world. With a shock I saw the likeness of myself I saw Ezra Karn and I saw "Those things we see up there are nothing more than mental images. They're Xartal's drawings!" "Don't you see," the lady continued. "Everything that Xartal put on paper has been seen by one or more of these cockatoos. The cockatoos are like Earth parrots all right, but not only have they the power of copying speech, they also have the ability to recreate a mental image of what they have seen. In other words their brains form a powerful photographic impression of the object. That impression is then transmitted simultaneously in telepathic wavelengths to common foci. That eyrie might be likened to a cinema screen, receiving brain vibrations from a hundred different sources that blend into the light field to form what are apparently three-dimensional images." The Larynx manager nodded slowly. "I see," he said. "But why don't the birds reconstruct images from the actual person. Why use drawings?" "Probably because the drawings are exaggerated in certain details and made a greater impression on their brains," Grannie replied. Up on the eyrie a strange performance was taking place. The duplicate image of Ezra Karn was playing leap frog with the image of Antlers Park. Then abruptly the screen before me blurred and went blank. "Sorry," the operator said. "I've used too much power already. Have to give the generators a chance to build it up again." The far wall was taken up by a huge window of denvo-quartz. As I stood there, something suddenly caught Ezra Karn's eye. He began to walk toward that window. "Look here," he said. part of the button appeared to be a powerful lens of some kind, and as rays of Jupiter's great spot. Someone had constructed this lens to concentrate and amplify the power of those rays. The internal clockwork served a double purpose. It opened a shutter, and it rotated the lens slowly so that it played for a time on each of the sleeping men. I slid the metal button in my pocket and left the barracks at a run. Back in the visiscreen room, I snapped to the operator: "Turn it on!" The kite car swam into view in the screen above the instrument panel. I stared with open eyes. Jimmy Baker no longer was in the car, nor doorway between. I headed for that entrance, and when I reached it, I shut off power with an exclamation of astonishment. There was a huge chair-shaped rock there, and seated upon it was Grannie Annie. She had a tablet in her hands, and she was writing. had been removed, and mounted on the hood was a large bullet-like contrivance that looked not unlike a search lamp. A blinding shaft of bluish radiance spewed from its open end. Playing it back and forth upon the marching men were Jimmy Baker and Xartal, the Martian. "Ultra violet," Grannie Annie explained. "The opposite end of the vibratory scale and the only thing that will combat the infra-red rays Interstellar Voice . Antlers Park

<question>:
What does the viviscreen do?

<options>:
A It plays a recording of something. In this case, it's of Grannie, Xarnal, and Jimmy Baker.
B It's stationary, and can only be used to view one place and time.
C It brings up a 3-D image of the person you are looking at and allows you to watch and hear them as if you were there.
D Like a computer or television screen, it allows you to see another person on the other end.

<answer>:

C