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

<passage>:
the U.S. copyright on this publication was renewed.] Some men just haven't got good sense. They just can't seem to learn the most fundamental things. Like when there's no use trying—when it's time to give up because it's hopeless.... In its last instant, the meteor fell on the Moon. It was impeded by "... And I don't know how long I sat there after I found the water." He looked at the Goldburgian device he had made out of wire and tubing. all of 'em. "The idea didn't come all at once, it took a long time for me to remember that water is made out of oxygen and hydrogen. When I remembered that, of course, I remembered that it can be separated with electricity. So I built this thing. "It runs an electric current through water, lets the oxygen loose in the room, and pipes the hydrogen outside. It doesn't work automatically, of course, so I run it about an hour a day. My oxygen level gauge shows how long." "You're a genius, man!" Jones exclaimed. claim." "Claim?" "Sure, man, I've thousands of tons of water here. It's the richest mine on the Moon!" THE END make it. By careful rationing, he could probably stretch his food out to more than a month. His drinking water—kept separate from the water in the reactor—might conceivably last just as long. But his oxygen was too carefully measured sixteen days. When he saw the wrecked turbine, he knew that he wouldn't there was a four-day reserve. By diligent reserve—plus one is five—plus sixteen days normal supply equals twenty-one days to live. conservation, he might make it last an extra day. Four days position. "Batteries must be dead," he told himself. "What batteries?" he asked. "There're no batteries in here, the power He thought this one out carefully. The generator was not turned by the main turbine, but by a small reciprocating engine. The steam, however, He fumbled for a while, until he found a small flashlight. By the light of this, he reinspected the steam system, and found about three gallons of water frozen in the condenser. The condenser, like all condensers, was a device to convert steam into water, so that it could be reused in the boiler. This one had a tank and coils of tubing in the center of a curved reflector that was positioned to radiate the heat of the steam the water in the condenser began to boil. This boiling lowered the temperature, and the condenser demonstrated its efficiency by quickly freezing the water in the tank. Evans sealed the turbine from the rest of the steam system by closing the shut-off valves. If there was any water in the boiler, it would operate the engine that drove the generator. The water would condense in the condenser, and with a little luck, melt the ice in there. Then, if the pump wasn't blocked by ice, it would return the water to the boiler. But there was no water in the boiler. Carefully he poured a cup of his drinking water into a pipe that led to the boiler, and resealed the water that he had poured into the boiler quickly turned into steam, and the steam turned the generator briefly. trouble was. "The water, man," he said, "there is not enough to melt the ice in the He opened the pipe again and poured nearly a half-gallon of water into the boiler. It was three days' supply of water, if it had been carefully used. It was one day's supply if used wastefully. It was ostentatious luxury for a man with a month's supply of water and twenty-one days to live. The generator started again, and the lights came on. They flickered as the boiler pressure began to fail, but the steam had melted some of the ice in the condenser, and the water pump began to function. was passing through them. This was to allow the air-conditioning system to function properly, and to prevent air loss in case of the highly improbable meteor damage. McIlroy thought that on the whole, he was did have one illusion he thought that he was completely unfit as a leader. It was true that his strictest orders were disobeyed with cheerful contempt, but it was also true his mildest requests were complied with eagerly and smoothly. didn't particularly care to have obeyed. For example, because of an order of his stating that there would be no alcoholic beverages within the survey building, the entire survey was assured of a constant supply of home-made, but passably good liquor. Even McIlroy enjoyed the surreptitious drinking. to sun-down, to supplement the nuclear power plant. Nobody answered. They could all see the Moon under their feet. Small potassium nitrate that anyone has ever seen. Man, it's a full inch across." All of these needed water to form, and their existence on the Moon puzzled him for a while. Then he opened the bag that had contained the to the Moon about once a month, carrying supplies in and metal and ores have to fight the union and the Lunar Trade Commission." the low-grade ores of uranium and vanadium, they need these things on Earth, but they can't get them as long as it isn't worth the carrying of them. And then, of course, there's the water we haven't got. We could afford to bring more water for more people, and set up more distilling plants if we had the money from the nickel. "Even though I say it who shouldn't, two-eighty a quart is too much to pay for water." Both men fell silent for a while. Then Jones spoke again: Part of his reasoning proved correct. That is, he found that by chipping, he could locate small bubbles up to an inch in diameter, each one with its droplet of water. The average was about one per cent of the volume of each bubble filled with ice. ten-minute reserve supply, and made it to the tractor with about five efficient as the one in the tractor it wasted oxygen. By using the suit the sweat. It didn't help much, and it left a blurred spot in his vision. That annoyed him. "Is everyone clear of the outlet?" he asked. boiler. A stream of muddy water gushed into a closed vat. When the vat was about half full, the water began to run nearly clear. An electric it'll probably blow at seven." The vat was a light plastic container used only to decant sludge out of the water. It neither needed nor had much strength. "Six now," said Cade. They could see the trickle of water from the discharge pipe. The motor turned the valve back and forth in response to Cade's signals. "We're probably O.K. in these suits for an hour," Cowalczk answered. "Is there a manual shut-off?" "Not that I know of," Lehman answered. "What about it, Cade?" "Is the light off?" Cowalczk asked. "No," Cade answered. "Water's stopped. Give us some pressure, we'll see if it holds." "Twenty pounds," Cade answered after a couple of minutes. "Take her up to ... no, wait, it's still leaking," Cowalczk said. "Hold "Think we weren't worried?" Lehman asked. "And it's not over." "What?" Cade asked. "Oh, you mean the valve servo you two bashed up?" "No," said Lehman, "I mean the two thousand gallons of water that we lost." "Two thousand?" Cade asked. "We only had seven hundred gallons reserve. How come we can operate now?" "We picked up twelve hundred from the town sewage plant. What with using the solar furnace as a radiator, we can make do." "Oh, God, I suppose this means water rationing again." "You're probably right, at least until the next rocket lands in a couple of weeks." carrying several days reserve of oxygen and supplies. Director intercommunications equipment. Nevertheless, receivers are ... rocket would be needed in the search."

<question>:
Moon inhabitants must make all of the following considerations regarding their equipment EXCEPT:

<options>:
A Protection from meteor showers and volcanic eruptions
B The cost of rare materials imported from Earth
C Protection from extreme temperatures
D The ability to function with minimal water use

<answer>:

C