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

<passage>:
As he exerted pressure on the knob, a thin slit in the side of the intercom began feeding out a long sheet of paper the new answer from the Brain. It reached a certain length, then was automatically sheared off within the intercom, and the sheet fell gently to the desktop. any scheme almost on sight—even where they had eluded the best brains in the ad agency where he worked. So when the Chief of World Security told him that he had been selected as the answer to the Solar System's greatest mystery, Jery assumed that it was because of his mental agility. time to pierce the maze of out-of-this-world double-dealing. For Jery had become a walking bomb, and when he set himself off, it would be the end of the whole puzzle of THE SECRET MARTIANS—with Jery as the first to go! Jack Sharkey decided to be a writer nineteen years ago, in the Fourth "I'd like to say I do this for fulfillment, or for cash, or because however, the real reason (same as that expressed by sleep late in the morning." 1 deadline memos. It was only a fraction of an instant between the time I saw them and the time they spoke to me, but in that miniscule interval I managed "... Yes," I said, some terrified portion of my mind waiting masochistically for them to draw their collapsers and reduce me to a " W-Will I be back?" I asked desperately, as we waited for the Baxter pressed the heels of his hands against his eyes for a moment, then sighed, grinned wryly, and waggled an index finger at an empty plastic contour chair. "I guess maybe you are at that, son. Sit down, sit down." "I suppose you're wondering why I've called—" he started, then stopped short and flushed with embarrassment. I felt a sympathetic hot wave flooding my own features. A copy chief in an advertising company almost always reacts to an obvious cliche. Then, with something like a look of relief on his blunt face, he snatched up a brochure from his kidney-shaped desktop and his eyes "Oh ... Oh, well if you put it like that. It's girls, sir. They block "I'm still not sure that I—" "It's like this. I designate ratios, by the minute. They hand me a new ad, and I read it by a stopwatch. Then, as soon as I spot the clinker, they stop the watch. If I get it in five seconds, it passes. But if I spot it in less, they throw it out and start over again. Or is that clear? No, I guess you're still confused, sir." "Just a bit," Baxter said. I took a deep breath and tried again. "Maybe an example would be better. Uh, you know the one about 'Three five. See?" "Ah," said Baxter, grinning. "I begin to. And your job is to test these ads, before they reach the public. What fools you for five seconds will fool the average consumer indefinitely." I sat back, feeling much better. "That's right, sir." "They—they block my thinking, sir, that's all. Why, take that example I just mentioned. In plain writing, I caught the clinker in one-tenth of a second. Then they handed me a layout with a picture of a lawyer Colonies, by the Brain." "You mean that International Cybernetics picked me for a mission? Baxter shrugged, and his genial smile was a bit tightly stretched. "When the current emergency arose and all our usual methods failed, we had to submit the problem to the Brain." "And," I said, beginning to be fascinated by his bewildered manner, "what came out?" and address!" "Uh-huh," Baxter grunted laconically. "It amuses you, does it?" The smile was still on his lips, but there was a grimness in the glitter of his narrowing eyes. "Not really," I said hastily. "It baffles me, to be frank." "If you're sitting there in that hopeful stance awaiting some sort of to make. IC had none to make. Damn it all to hell!" He brought a meaty fist down on the desktop. "No one has an explanation! All we know is that the Brain always picks the right man." I let this sink in, then asked, "What made you ask for a man in the first place, sir? I've always understood that your own staff "Hold it, son. Perhaps I didn't make myself clear. We asked for no man. We asked for a solution to an important problem. And your name was what we got. You, son, are the solution." Chief of Security or not, I was getting a little burned up at his highhanded treatment of my emotions. "How nice!" I said icily. "Now if I only knew the problem!" Baxter blinked, then lost some of his scowl. "Yes, of course " Baxter "And you finally had to resort to the Brain, and it gave you my name, talk to me man-to-man. "Look, son, an adding machine—which is a minor form of an electronic brain, and even works on the same principle—can tell you that two and two make four. But can it tell you why? "Well, no, but—" "That, in a nutshell is our problem. We coded and fed to the Brain every shred of information at our disposal the ages of the children, last seen, and what they were wearing. Hell, everything! The machine took the factors, weighed them, popped them through its billions of relays and tubes, and out of the end of the answer slot popped a single "That's just it," Baxter sighed. "We don't even know that! We're like a savage who finds a pistol: used correctly, it's a mean little weapon Now, the question is: Which way do we point you?" "You got me!" I shrugged hopelessly. given only to Security Agents, so deadly was its molecule-disrupting And well they might be. An Amnesty-bearer can suddenly decide a subject is not answering questions to his satisfaction and simply blast the annoying party to atoms. It makes for straight responses. Of course, "I don't really have any details," I said, and waited for him to take his cue. As an afterthought, to help him talk, I added, "At ease, by leaving a trace. "Chow time, sir. That's when you expect to have the little—to have the kids in your hair, sir. Everyone wants his rations first—You know Earth is calculated with regard to the mass on board, is that correct?" He nodded. "Good, that clears up an important point. I'd also like to last—interview with Chief Baxter. I had a slight inkling why the Brain "It's the Amnesty that does it," he said, gesturing toward the disc. It fed into the Brain would produce some other results, not involving me. protocol to be dealt with, government agencies to be checked with, classifications, bureaus, sub-bureaus, congressional committees. It consulting someone else. And the time lag and paperwork involved made accurate and swift action impossible, sometimes. What we needed, of would have put us right back where we'd been before. No, we left it up to the Brain. We'd find ourselves in a tight situation, and the Brain after being fed the data, would come up with either a solution, or a name." receive the Amnesty, is that it?" Baxter nodded. "The Brain just picks the men. Then we tell the men the situation, hand over the Amnesty, and pray." I had a sudden thought. "Say, what happens if two men are selected by the Brain? Who has authority over whom?" the thing was out of my hands. Baxter had the information I'd come up with, and it had been coded and fed to the Brain. As soon as the

<question>:
Why is the Brain so effective?

<options>:
A it explains the best answer to any problem
B it thinks like the most intelligent human
C it uses logic to make the best decisions
D it predicts the problem and the solution before it's asked

<answer>:

C