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

<passage>:
what would happen?" "I know one thing—I wouldn't be there holding your ankle while you found out." Don Cort, stranded on that rising town, was beginning to suspect that But after a couple of weeks of floating around, it began to be obvious that the professor had no idea how to get them down. So then it was up to Cort: either find a way to anchor Superior, or spend the rest of his like it here?" "If you mean don't I like you, the answer is yes, of course I do. But if I don't get out of this handcuff soon so I can take a bath and get into clean clothes, you're not going to like me." she said, "before you deteriorate." They were in the midst of an extremely pleasant kiss when the brief case at the end of Don's handcuff began to talk to him. confirmed that the town undoubtedly was missing. They put in a call to the National Guard. The guard surrounded the area with troops—more than a thousand were needed—to keep people from falling into the pit. A pilot who flew over it reported that it looked as if a great ice-cream scoop had bitten into the witching hour. Somebody else said nonsense, they'd better check for radiation. A civil defense official brought up a Geiger counter, but no matter how he shook it and rapped on it, it refused to click. A National Guard officer volunteered to take a jeep down into the pit, having found a spot that seemed navigable. He was gone a long time but had been over the state. Washington said no. The Pentagon and the Atomic Energy Commission denied that they had been conducting secret experiments. Nor had there been any defense plants in Superior that might have blown course to avoid it. He noted with only minimum satisfaction that his " Cold up here!" 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 hurried along the tracks. 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 his teeth and nibbling at it thoughtfully. But it was likely that all she noticed then was the brief case he carried, attached by a chain to a handcuff on his left wrist. "Will we be here long?" Don asked the conductor. He didn't want to miss his plane at Columbus. The sooner he got to Washington, the sooner he'd get rid of the brief case. The handcuff it was attached to was one reason why his interest in the redhead had been only passing. "Can't say," the conductor told him. He let the door close again and 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 Don saw two men who must have been the engineer and the fireman talking The engineer was exasperated. He turned to the fireman. "You look. Humor the old man. Then let's go." The bearded man—he called himself Professor Garet—went off with the fireman. Don followed them. They had tramped a quarter of a mile along Don Cort and the fireman walked cautiously toward the edge while the Standing on tiptoe and repressing a touch of giddiness, Don looked over Don looked at the fireman, who had an unbelieving expression on his Don Cort, sitting in the back seat of the car with the redhead from the "Washington?" Don said. "That's where I'm going. I mean where I "Not everybody. Me, for instance." "No?" she said. "Judging by that satchel you're handcuffed to, I'd have thought you were a courier for the Pentagon. Or maybe State." He laughed quickly and loudly because she was getting uncomfortably to sleep," she corrected. She looked angry. "Of course," Don said, puzzled by her emphasis. "Come on. Where they put you, you'll probably be surrounded by co-eds, even if I could get out of this cuff." He took her bag in his free hand and they were met by a gray-haired woman who introduced herself as Mrs. Garet. "We'll try to make you 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 was inside the brief case was too big. Cavalier had given him a room to himself at one end of a dormitory and he'd taken his pants off but had had to sleep with his coat and shirt on. He got up, feeling gritty, and did what little dressing was necessary. others had gone from their unmade beds. He shivered as he stepped 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 "You're Mr. Cort," she said. "Won't you join me?" "Thanks," he said, unloading his tray. "How did you know?" "The mystery man with the handcuff. You'd be hard to miss. I'm Alis—that's A-l-i-s, not A-l-i-c-e—Garet. Are you with the FBI? Or did you escape from jail?" I'm duty-bound to represent the second generation at the nut factory." "Nut factory? You mean Cavalier?" Don struggled to manipulate knife and "I didn't know there were any." "Actually there's only one, the Superior Sentry Don blinked at the headline: Don read the story, which seemed to him a capricious treatment of an (b) lacks space to publish and which (it being atrociously "On such short notice?" Don was intrigued. Last night the redhead from They walked south from the campus and came to the railroad track. The except for the conductor, who had dutifully spent the night aboard. stopped I thought it was running alongside a creek for a while." "South Creek," Alis said. "That's right. It's just over there." Let's go look at the creek." They found it coursing along between the banks. 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." "I should think it'd be all dried up by now. I'm going to have a look." "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 ankle and held it tight. "Just in case a high wind comes along," she said. "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 and had to put his head back on the ground. "Sorry," she said. Don opened the compact and carefully transferred it to his right hand. "Why? How?" "I can't see too well, but that's my impression. Hold on now. I'm coming back." He inched away from the edge, then got up and brushed himself off. He returned her compact. "I guess you know where we go next." "The other end of the creek?" South Creek did not bisect Superior, as Don thought it might, but flowed go, past South Creek Bridge—which used to lead to Ladenburg, Alis the creek, they found a wire fence at the spot. "This is new," Alis so they could see the mouth of the creek. The water flowed from under Protecting mouth of South Creek, one of . "What's the other source, besides the faucet in your bathroom?" Don to swim." "If it were on the edge, and if I took a rowboat out on it, I wonder

<question>:
Why did Don want to walk by the creek?

<options>:
A to see if they could get off of Superior via the creek
B to learn more about the levitating town
C to get to know Alis better
D to help get rid of the handcuff

<answer>:

B