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

<passage>:
That's just line! Is Evans—?" Evans was carrying a block of ice into the tractor when he saw the "Evans, man!" said Jones' voice in the intercom. "Alive you are!" Later, in Evans' tractor, he was telling his story: "... 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. "Finally I built this thing. These caves were made of lava. They must 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." Evans was a prospector, and like all prospectors, a sort of jackknife "You're a genius, man!" Jones exclaimed. Evans, who had no watch, thought of the time as a quarter after "Back?" "Well, it was to rescue you that I came." "I don't need rescuing, man," Evans said. Jones stared at him blankly. "You might let me have some food," Evans continued. "I'm getting short Evans was due back at Williamson Town at about sunset, that is, in about sixteen days. When he saw the wrecked turbine, he knew that he wouldn't 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 there was a four-day reserve. By diligent "Well, man, 'tis a fine spot you're in now," he told himself. "Let's find out how bad it is indeed," he answered. He reached for the light switch and tried to turn it on. The switch was already in the "on" position. "Batteries must be dead," he told himself. "What batteries?" he asked. "There're no batteries in here, the power comes from the generator." "Why isn't the generator working, man?" he asked. He thought this one out carefully. The generator was not turned by the main turbine, but by a small reciprocating engine. The steam, however, came from the same boiler. And the boiler, of course, had emptied itself 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 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. water that he had poured into the boiler quickly turned into steam, and the steam turned the generator briefly. Evans watched the lights flicker and go out, and he guessed what the trouble was. 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. "Well, man," he breathed, "there's a light to die by." He felt a little guilty about this, because he had ordered that all doors in the survey building should remain closed except when someone 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 disobeying his own orders no more flagrantly than anyone else in the survey. McIlroy had no illusions about his ability to lead men. Or rather, he 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 Everyone in the survey except McIlroy realized this, and even he accepted this without thinking about it. He had fallen into the habit of suggesting mildly anything that he wanted done, and writing orders he didn't particularly care to have obeyed. anything that it was desirable to heat. It was used mostly, from sun-up to sun-down, to supplement the nuclear power plant. "Wasn't anybody out in it." "Hey, Chuck," another technician, Lehman, broke in, "you could maybe get hurt that way." After the sun rose, Evans returned to the lava cave that he had been waste oxygen. The ones that looked like zeolites were zeolites, all right, or something very much like it. One of the crystals that he "I swear, Mac," said Jones, "another season like this, and I'm going back to mining." McIlroy noticed that his friend's glass was empty, and he quietly filled it again. Both men fell silent for a while. Then Jones spoke again: "Have you seen our friend Evans lately? The price of chromium has gone "He's out prospecting again. I don't expect to see him until sun-down." "Well, if I don't see him, you let him know about the chromium." when Evans had quarried all the ice that was available in the cave. The thought grew on him as he worked that this couldn't be the only such A quarter of a mile from the tractor, Evans found a promising looking mound of lava. It was rounded on top, and it could easily be the dome of a bubble. Suddenly, Evans noticed that the gauge on the oxygen tank of his suit was reading dangerously near empty. He turned back to his tractor, moving as slowly as he felt safe in doing. Running would use up oxygen too fast. He was halfway there when the pressure warning light went on, and the signal sounded inside his helmet. He turned on his ten-minute reserve supply, and made it to the tractor with about five minutes left. The air purifying apparatus in the suit was not as efficient as the one in the tractor it wasted oxygen. By using the suit so much, Evans had already shortened his life by several days. He resolved not to leave the tractor again, and reluctantly abandoned his plan to search for a large bubble. "What's going on out there?" demanded McIlroy on the intercom. "Scale stuck in the valve," Cowalczk answered. "Not that I know of," Lehman answered. "What about it, Cade?" "I don't think so," Cade said. "I'll get on the blower and rouse out an engineer." "O.K., but keep working that switch." McIlroy released a statement today that Howard Evans, a prospector is missing and presumed lost. Evans, who was apparently exploring presumed that he was merely temporarily delayed. Evans began his exploration on August 25th, and was known to be carrying several days reserve of oxygen and supplies. Director McIlroy has expressed a hope that Evans will be found before his oxygen runs out. dark. Little hope is held for radio contact with the missing man as it is believed he was carrying only short-range, saying to McIlroy, "a Welshman knows when his luck's run out. And never "Like as not, you're right," McIlroy replied, "but if I know Evans, he'd tells me that Evans will be found." "Well, yes," Jones answered. "I thought that it might happen that a "About Evans?" Phelps shook his head slowly. "Palomar called in a few this banker, who had never met Evans, was losing so much sleep about finding him. It began to dawn on McIlroy that nearly the whole

<question>:
What does Jones likely think Evans is up to when he finds him?

<options>:
A He saw that he was setting up a mine to start collecting water
B He thought he had found a new source of crystals
C He thought he was already dead
D He thought his oxygen machine was meant to be a temporary survival tool

<answer>:

D