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

<passage>:
"Clark, how's the time going?" Cheyney consulted the stopwatch. diving for it—not in time, anyhow. Remember when the Navy lost a barge-load of shells in the harbor, back in '52? They scrabbled for them ("One-Shot") Braun was in the city going about his normal business, that if it found anything funny-looking which was making another million said object, or shake it either. We're better equipped than the Navy was then—but we're working against a for a year and never pulled up a one they finally had to warn the public deadline." into his affairs, but nobody had explained we need is an inspired guess. Get into the computer for Next Time. It's identifying the egg had been keeping the wires to Washington steaming for an hour before that, getting authorization to haven't any way of finding out. It spring despite his age. His clothing C&amp R—clean and routine). I was in the central office when the call came through, and had some was as far from that of a gambler as you could have taken it difficulty in making out precisely all perfectly fitted, all worn with proper casualness—one How did you find out about this egg all, a black Homburg Braun was in the suit with him. "I come over as soon as your runner were defective," he said. "It seems that this egg was buried among a lot of other got to me," he said. "What's the crates in the dump-cell of the Ludmilla something out in the harbor. We don't know what it is. It may be "It's a sea lock for getting rid of fitting for ships carrying explosives, got to find out which—and we want up unexpectedly." "All right," I said. "Go ahead." "Well, there was a timer on the dangerous cargo. The bottom of it when the ship came up the river. That worked fine, but the automatic bulkheads that are supposed to keep the rest of the ship from being flooded you got machines to tell you answers had all the brains it needed—ain't I pointed silently to Joan, who had on the mike to the divers. She was gone back to work the moment the like that?" Harbor Patrol found the dump-cell shape—it's buried too deeply in the open, they called us in." "I see." I thought about it a moment. "In other words, you don't introductions were over. She was still oing ... "Try the Geiger." "We did. Nothing but background." "Scintillation counter?" "Nothing, Dr. Hadamard. Could be it's shielded." "Let us do the guessing, Monig. All right, maybe it's got a clockwork the whole procedure was designed to be automatic." fuse that didn't break with the impact. "You've got divers down?" that none of them know anything could be a bomb—it could be anything. We're sweating everybody on "All right, we'll take it," I said. Or a gyroscopic fuse. Stick a show-down hand. We've got to have an expert call it for us—somebody from his breast pocket, and why should you guess wrong? Your no one of which had had the money to buy one for itself. The Eisenhower administration, with its emphasis within the practicable lifetime of CIA. I buzzed for two staffers, and in five minutes got Clark Cheyney and those capacities, but said service takes about two per cent of their capacities and their time. I shot them a couple of sentences of explanation, trusting needed from the tape, and checked the line to the divers' barge. Braun's face was a death mask. The water sounds and the irregular ticking of a Geiger counter seemed to spring out from the audio speaker, four times as loud as before. I could even hear the pen of the seismograph scribbling away, until ... Underwater noises, shapeless "Hello, out there in the harbor. crushed in his hand. wanted it this way. I say it's a bomb. " "Keep trying." Cheyney, looking even more like a bulldog than usual, was setting his stopwatch by one of the eight clocks on ULTIMAC's face. "Want me to take the divers?" he said. Braun. If it isn't already too late—" Cheyney shot out a hand and caught Anderton's telephone arm by passed the mike to her. "You'd better "Check." He began feeding tape into the integrator's mouth. "What's run a probability series first." She nodded and spoke into the mike. "Monig, unscrew the cap." prove anything. The egg might have whether the crew was exposed or not. squawked. "But Dr. Hadamard, if that sets it off—" "It won't go off. That's the one "What is this?" Anderton demanded. "Unscrew the cap?" the audio But it hasn't got a fuse. Now how could they have made a fool mistake it's a real egg or not—we can't take all we know now, evacuating the city to do—so they can grab it unharmed. when you hired us," I pointed out. "If you want to evacuate without our O.K., you'll have to fire us first. It'll take another hour to get that cleared from Washington—so you might as count, and I got out the door, fast. we didn't know in detail—after it A reasonable man would have said that I found nothing useful on the after it was put on board the ship, out the nature of the bomb—which found would have been a surprise to me I went down looking for surprises. that object was a live bomb. We asked whether it was a bomb or not. I found nothing but a faint The expression on Braun's face was exactly like the one he had worn while he had been searching for his You said it was, and you were right." were open, I could see that it was directed at me. "If this was the old days," he said in an ice-cold voice, "I might of made the colonel's idea come true. I don't go for tricks like up some traces on the docks. In those "It was more than a trick," Clark put in. "You'll remember we had sole visible function of which had who knew the signs could still pick For some reason, he had been amused by the brash youngster who'd barged in on him and demanded the lowdown, and had shown me considerable lengths of ropes not normally to figure out what kind of a thing had been dropped. If we had still failed to establish that when the Joan had the divers unscrew the cap. in a detonation, if the bomb in the waterfront, for he'd gone respectable we did do it in the test was a concession of failure—an admission that our usual methods didn't come through for us in time. "And that means that you were was called investment—mostly in real estate realtors knew him well as the our investigation. Your intuition for almost in the equation stands for the moment it." "I'd sooner try to crack a Timkin bearing," I said. "Braun's ten-point so much as pulled the rope to raise the curtain." and if they were to succeed it substitute." "Of course it isn't," Joan had said. "The next thing he'll do is go in for board the ship now, but it's my guess —or did it? I kept remembering Anderton's challenge: "You Braun chuckled. "I still know a thing or two," he said. "What's the angle?" "You'll get it," I said. "Thanks, Mr. Braun." I called headquarters and sent a messenger to my apartment to look them, with orders to scorch it over to Braun without stopping to breathe more than once. Then I went back whole posture telegraphed his controlled helplessness. Cheyney was bent over a seismograph, echo-sounding working, I knew, he'd have had the trains of the Hudson &amp through their tubes would have from the egg. I can just figure out what it is. Remember One-Shot Braun?" black. "Is that operation getting you anywhere?" don't even know if that's the egg—the whole area is littered with crates. Harris, you've got to let me get that alert out!"

<question>:
How did the divers find what the object was?

<options>:
A They didn't find out
B The unscrewed the top
C They used ESP experiments
D They used a Geiger Counter

<answer>:

B