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

<passage>:
"We could tell by the sun, silly." high enough to see very far. If we were we'd be able to see the Great cloudbank and, a second later, veered sharply. They could make out UAL on the underside of a wing. As it turned they imagined they could see Don Cort, stranded on that rising town, was beginning to suspect that faces peering out of the windows. They waved and thought they saw one or A truck driver named Pierce Knaubloch was the first to report it. He had at the end of Don's handcuff began to talk to him. Knaubloch couldn't see the extent of the pit because it was too dark, his first thought. He backed up two hundred feet, set out flares, then having found a spot that seemed navigable. He was gone a long time but relatively smooth, and did not smell of high explosives. He'd found no loomed out of a cloudbank at twelve thousand feet and Studley changed course to avoid it. He noted with only minimum satisfaction that his Don Cort had been dozing in what passed for the club car on the Buckeye wasn't Columbus. All he could see were some lanterns jogging as trainmen Don had taken a passing interest earlier in the evening asked, "Why did The girl's hair was a subtle red, but false. When Don had entered the along the part was dark. Her eyes had been on a book and Don had the Her glance upward at that moment interrupted his examination, which had been about to go on to her figure. Later, though, he was able to observe If the girl had given Don Cort more than that one glance, or if it had been a trained, all-encompassing glance, she would have seen a man in Don hesitated, shrugged at the redhead, said, "Excuse me," and followed sat in the dark, hissing steam. Don made his way up to the locomotive Some sort of barricade had been put up across the tracks and it was lanterns, both battery and electric flashlights road flares Don saw two men who must have been the engineer and the fireman talking "You'd go over the edge, I tell you," the old gentleman was saying. "Look for yourself," the old man in the white helmet said. "Go ahead. fireman. Don followed them. They had tramped a quarter of a mile along the gravel when the fireman stopped. "Okay," he said "where's the edge? "Behold," he said. "Something even Columbus couldn't find. The edge of True, everything seemed to stop, and they could see stars shining low on Don Cort and the fireman walked cautiously toward the edge while the Nevertheless, Don could see that it apparently was a neat, sharp edge, Standing on tiptoe and repressing a touch of giddiness, Don looked over the edge. He didn't have to stand on tiptoe any more than he had to sit situation seemed to call for it. Over the edge could be seen a big Don looked at the fireman, who had an unbelieving expression on his "You see what I mean," he said. "You would have gone right over. I believe you would have had a two-mile fall." Don Cort, sitting in the back seat of the car with the redhead from the The girl smiled sideways. "We have a nodding acquaintance." Don nodded "Are you connected with the college?" Don asked. "Was there any sort of explosion?" Don asked. "What's that?" Don asked. "Maybe not a plane," Don said, "but a helicopter could land just about "Hm," said Hector Civek. Don couldn't quite catch his expression in the He laughed quickly and loudly because she was getting uncomfortably close. "Oh, no. Nothing so glamorous. I'm a messenger for the Riggs Don laughed again. "He sure is." "Of course," Don said, puzzled by her emphasis. "Come on. Where they put They had a glimpse of the professor, still in his CD helmet, going around a corner, gesticulating wildly to someone wearing a white Don Cort had slept, but not well. He had tried to fold the brief case to pull it through his sleeve so he could take his coat off, but whatever himself at one end of a dormitory and he'd taken his pants off but had and things were going on. He had a view of the campus from his window. A outdoors. It was crisp, if not freezing, and his breath came out visibly. First he'd eat, he decided, so he'd be strong enough to go take a good look over the edge, in broad daylight, to the Earth below. got in line with a tray for juice, eggs and coffee. He saw no one he you escape from jail?" "How do you do. No, just a bank messenger. What an unusual name. Professor Garet's daughter?" "How do you get down from an elephant? Old riddle. You don't Don blinked at the headline: Don read the story, which seemed to him a capricious treatment of an Don skimmed the rest. "I don't see anything about it being deliberate." Alis had been creaming and sugaring Don's coffee. She pushed it across Don creased the paper the other way, took a sip of coffee, nodded his (b) lacks space to publish and which (it being atrociously handwritten) he (c) has not the temerity to ask his linotype operator to Don said, "I'm beginning to like this Ed Clark." emphasizing her good figure. To a male friend Don would have described Don grinned. "Going on?" The conductor reckoned as how he might just do that, and did. stopped I thought it was running alongside a creek for a while." "Is it still? I mean hasn't it all poured off the edge by now? Was that Alis shrugged. "All I know is you turn on the faucet and there's water. Let's go look at the creek." They found it coursing along between the banks. let's follow it to the edge." The brink, as Alis called it, looked even more awesome by daylight. Creek surging along, then nothing. In the distance a clump of trees, "Where is the water going?" Don asked. "I can't make it out." "Don't! You'll fall off!" "I'll be careful." He walked cautiously toward the edge. Alis followed topographer's map, far below. Don took another wary step, then sat down. "I still can't see where the water goes," Don said. He stretched out on could almost reach the edge. He gave another wriggle and the fingers of "Thanks. It helps. Okay, here we go." He lifted his head. "Damn." "What?" "It still isn't clear. Do you have a pocket mirror?" "I have a compact." She took it out of her bag with her free hand and tossed it to him. It rolled and Don had to grab to keep it from going over the edge. Alis gave a little shriek. Don was momentarily unnerved He held it out beyond the edge and peered into it, focusing it on the end of the creek. "Now I've got it. The water "Down, of course, but it's as if it's going into a well, or a vertical back." He inched away from the edge, then got up and brushed himself South Creek did not bisect Superior, as Don thought it might, but flowed in an arc through a southern segment of it. They had about two miles to out of play, Don thought) and on to the edge again. the creek, they found a wire fence at the spot. "This is new," Alis The fence, which had a sign on it, semicircular, with each end at the edge and tarpaulins strung behind it so they could see the mouth of the creek. The water flowed from under two sources of water for Superior. Electrical charge in fence is "What's the other source, besides the faucet in your bathroom?" Don "If it were on the edge, and if I took a rowboat out on it, I wonder

<question>:
What did Don use as a method for seeing over the edge of the stream?

<options>:
A A mirror found in the Cavalier dorms.
B A compact from Miss Jervis.
C A compact from Alis.
D A camera to take a photograph.

<answer>:

C