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

<passage>:
see the pyramid growing smaller behind me, water gushing out of the base Three: The priests should be satisfied. The water was running again, my motion. Before it could fall, I had my Solar out and, with a wide-angle antagonistic toward future ancestral messengers. I stripped off my tattered lizard suit back in the ship, very glad that found them buried in the back of their oldest warehouse. This was the It was all very depressing, so I stopped for a drink, then went on to opened the entire universe. They are built on planets and generate feeding a course tape into the robot pilot, I strapped into the was a mushy-looking, wet kind of globe. I tried to make sense out of The image blinked, focused—and a great damn pyramid swam into in a ten-mile circle was this pyramid—and that definitely I dived the eye lower. The pyramid was a crude-looking thing of undressed stone, without carvings or decorations. There was a shimmer of pyramid was a hollow basin filled with water. When I saw that, something clicked in my mind. Locking basin on top of it for water this was used to cool the reactor that powered the monstrosity. If the water was still there, the beacon was still there—inside the pyramid. The natives, who, of course, weren’t even mentioned by the idiots who constructed the thing, had built a nice heavy, thick stone pyramid around the beacon. into a circular orbit about twenty feet above the pyramid. The summit of the stone pile was now covered with lizards of some type, apparently the only locked inside a mountain of handmade stone, but I had managed to irritate the things who had built the pyramid. A great beginning for a Normally, a repairman stays away from native cultures. They are poison. Anthropologists may not mind being dissected for their science, but a repairman wants to make no sacrifices of any kind for his job. For this reason, most beacons are built on uninhabited planets. If a beacon has to go on a planet with a culture, it is usually built in some inaccessible place. it was a little disconcerting to see it float by. I located a lizard town about a thousand kilometers from the pyramid and dropped the eye. It swished down and landed at night in the bank of the local mud wallow. This was a favorite spot that drew a good crowd during the day. In the the swamps outside the town. I had one of the working eyes dig a cave in an outcropping of rock and wait for him. In addition to the pyramid being around the beacon, there was a nice little religious war going on around the pyramid. It all began with the land bridge. Apparently the local lizards had been living in the swamps when the beacon was built, but the builders spot, and the lizards began to wander up beacon valley. And found religion. A shiny metal temple out of which poured a constant stream of magic water—the reactor-cooling water pumped down from the atmosphere condenser on the roof. The radioactivity in the water didn’t hurt the natives. It caused mutations that bred true. A city was built around the temple and, through the centuries, the pyramid was put up around the beacon. A special branch of the priesthood served the temple. All went well until one of the priests violated the temple and destroyed the holy waters. There had been revolt, strife, murder and destruction since then. But still the holy waters would not flow. Now armed mobs fought around the temple each day and a new band of priests guarded the sacred fount. And I had to walk into the middle of that mess and repair the thing. It would have been easy enough if we were allowed a little mayhem. I could have had a lizard fry, fixed the beacon and taken off. Only “native life-forms” were quite well protected. There were spy cells on my ship, all of which I hadn’t found, that would When the head was done, I peeled it off and attached it to an attractive anchored around my waist. Then I filled the frame with all the equipment horrible but effective. The tail dragged me down in the rear and gave me a duck-waddle, but that only helped the resemblance. That night I took the ship down into the hills nearest the pyramid, an out-of-the-way dry spot where the amphibious natives would never go. A little before dawn, the eye hooked onto my shoulders and we sailed straight up. We hovered above the temple at about 2,000 meters, until it was light, then dropped straight down. enough for the natives. The first one that spotted me screamed and dropped over on his back. The others came running. They milled and mobbed and piled on top of one another, and by that time I had landed in the plaza fronting the temple. The priesthood arrived. after the pterodactyl-eye picked him up and dropped him in the swamp. Before they could think up a good answer, I was inside. The temple was a small one built against the base of the pyramid. I hoped I wasn’t breaking too many taboos by going in. I wasn’t stopped, so it looked all right. The temple was a single room with a murky-looking pool at one end. Sloshing in the pool was an ancient reptile who clearly was one of the leaders. I waddled toward him I drew up my scaly figure in a noble gesture and pointed toward the ceiling. “I come from your ancestors to help you. I am here to restore the Holy Waters.” This raised a buzz of conversation behind me, but got no rise out of the chief. He sank slowly into the water until only his eyes were showing. I hole in the floor with a great show of noise and smoke. The First Lizard knew I was talking sense then and immediately called a meeting of the shamans. It, of course, took place in the public bathtub and I had to join them there. We jawed and gurgled for about an hour and settled all the major points. the previous ones had all been boiled for letting the Holy Waters cease. They found out I was there only to help them restore the flow of the waters. They bought this, tentatively, and we all heaved out of the tub and trickled muddy paths across the floor. There was a bolted and guarded door that led into the pyramid proper. While it was being opened, the First Lizard turned to now. I need my eyes to see and mend the Fount of Holy Waters. Once the by just reversing the water-valve switch. This valve was supposed to be used only for repairs, after the pile was damped. When the water was cut I could start the water again easily enough, but there was no fuel left in the reactor. but slowly. The water-feed pipe from the roof, for example. The pipe they were loaded in a metal crate. In the darkest hour before dawn, the narrow temple stairs and I enjoyed a good sleep. It was resting inside at the power leads. I even hooked a gadget to the water pipe so their Holy Waters would have the usual refreshing radioactivity when they started flowing again. The moment this was all finished, I did the job I threw the switch that started the water flowing again. There were a few minutes while the water began to gurgle down through the dry pipe. Then a roar came from outside the pyramid that must have for the eye-burning ceremony. was bolted and barred from the other side. “It has been decided,” a lizard said, “that you shall remain here forever and tend the Holy Waters. We will stay with you and serve your every need.” The rest of their clan showed up at the foot of the stairs and made a crowd, I faced up to the First Lizard in his tub. He sank slowly beneath the surface. “What lack of courtesy!” I shouted. He made little bubbles in the water. “The ancestors are annoyed and have decided to forbid entrance to the Inner Temple forever though, out of kindness, they will let the waters flow. Now I must return—on with the

<question>:
What was the purpose of the pool of water on top of the pyramid

<options>:
A To cool the reactor hidden within the pyramid
B To provide a source of drinking water for the natives
C To collect solar energy and create power
D To serve as a religious bathing site for the natives

<answer>:

A