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

<passage>:
THE BIG HEADACHE BY JIM HARMON What's the principal cause of headaches? Why, having a head, of course! Macklin was playing jacks. "Do you think we'll have to use force on Macklin to get him to against that repatriated fullback." Ferris fingered the collar of his starched lab smock. "Guess I got carried away for a moment. But Macklin is exactly what we need for a Macklin had answered the of all headaches." Mitchell's blue eyes narrowed and his boyish face took on an expression "Sure," Macklin said, "if you say so. Why shouldn't I believe you?" "That's what I meant to say. But I'm not sure it would be completely ethical with even a discovery partly mine." "You're right. Besides who cares if you or I are cured of headaches? Our reputations don't go outside our own fields," Mitchell said. "But now Macklin—" able to frame an argument with it. Macklin was in his early fifties but astra per aspirin . The only thing that could delay the project was Macklin's health. Despite his impressive body, some years before he had suffered a mild stroke ... or at least a vascular spasm of a cerebral artery. It was known that he suffered from the vilest variety of migraine. A cycle of the headaches had caused him to be absent from his classes for several weeks, and there were an unusual number of military uniforms seen "I imagine he will," Mitchell said. "Macklin's always seemed a decent have me intrigued. What is it all about?" "Doctor, we understand you have severe headaches," Mitchell said. Macklin nodded. "That's right, Steven. Migraine." "That must be terrible," Ferris said. "All your fine reputation and lavish salary can't be much consolation when that ripping, tearing agony begins, can it?" "No, Harold, it isn't," Macklin admitted. "What does your project have to do with my headaches?" "Doctor," Mitchell said, "what would you say the most common complaint of man is?" from what you have said you mean headaches." "Headaches," Mitchell agreed. "Everybody has them at some time in his life. Some people have them every day. Some are driven to suicide by their headaches." "Yes," Macklin said. "But think," Ferris interjected, "what a boon it would be if everyone could be cured of headaches forever such a shot? Can you cure headaches?" "We think we can," Ferris said. "How can you have a specific for a number of different causes?" Macklin a number of different causes for headaches—nervous of all of this, the one real cause of headaches," Mitchell announced. "We have definitely established this for this first time," Ferris added. over-production of the pituitary gland. We have artificially bred a virus that feeds on pituitrin." "That may mean the end of headaches, but I would think it would mean works, I could stop using that damned gynergen, couldn't I? The stuff makes me violently sick to my stomach. But it's better than the migraine. How should I go about removing my curse?" He reinserted the pipe. "I assure you, you can forget ergotamine tartrate," Ferris said. "Our "Will work," Macklin said thoughtfully. "The operative word. It "But not on humans?" Macklin asked. Macklin coughed. "I don't want to overestimate my value but the run a large-scale field test. But we haven't the time or money for that. We can cure the headaches of one person and that's the limit of our resources." "I'm tempted," Macklin said hesitantly, "but the answer is go. I mean Macklin ran the back of his knuckles across his forehead. "I really nausea, eh? The pain of that turns you almost wrong side out, doesn't it? You aren't much better off with it than without, are you? I've heard some say they preferred the migraine." Macklin carefully arranged his pipe along with the tools he used to Macklin held his head in both hands. "Why did you two select Mitchell or I cured ourselves of headaches—they might not even believe us if we said we did. But the proper authorities will believe a man of your reputation. Besides, neither of us has a record of chronic migraine. You do." "Yes, I do," Macklin said. "Very well. Go ahead. Give me your injection." "Yes, we wanted to show our proof to the trustees—but not broadcast unverified results to the press. It's too early for that!" "Don't be so stuffy and conservative, Mitchell! Macklin's cured, isn't he? By established periodic cycle he should be suffering hell right now, shouldn't he? But thanks to our treatment he is perfectly happy, with no unfortunate side effects such as gynergen produces." "It's Macklin's wife," Ferris said. "Do you want to talk to her? I'm no "Mrs. Macklin! I think I had better talk to you later when you are Macklin?" he asked without removing his hand from the telephone. a great deal more active than Dean," Mitchell said. "Yes, but Dean isn't sick. He just doesn't seem to have as much nervous energy to burn up. Nothing wrong with his thyroid either." Macklin's traditional ranch house was small but attractive in Under Mitchell's thumb the bell chimbed dum-de-de-dum-dum-dum . Mrs. Macklin was an attractive brunette in her late thirties. She wore "You are the gentlemen who gave Dr. Macklin the unauthorized The colonel smiled thinly. "Dr. Macklin is my concern. And everything suddenly realized Macklin used a pipe as a form of masculine protest to "What did he mean, Macklin is an idiot?" Mitchell asked. "Not an idiot," Colonel Carson corrected primly. "Dr. Macklin is a "I'm not so dumb," Macklin said defensively. "But—" Mitchell said, impatient to examine Macklin for himself. "Very "We merely cured him of his headaches," Mitchell said. "How?" "All I want to know is why Elliot Macklin has been made as simple as if he had been kicked in the head by a mule," Colonel Carson said. is replaceable. But the chances of an Elliot Macklin are very nearly once in a human race." "Just a moment," Mitchell interrupted, "we can cure Macklin." my headaches, like before?" Mitchell coughed into his fist for an instant, to give him time to frame an answer. "Unfortunately, yes. Apparently if your mind functions Macklin slowly shaking his head. Macklin nodded. "Troubled, anyway. Disturbed by every little thing. are millions of morons running around loose in the United States. They can get married, own property, vote, even hold office. Many of them do. You can't force him into being cured.... At least, I don't think They found Mrs. Macklin in the dining room, her face at the picture cure your husband of his present condition." "Really?" she said. "Did you speak to Elliot about that?" "Y-yes," Colonel Carson said, "but he's not himself. He refused the he's certified incompetent, authorities can rule whether Mitchell and Ferris' antitoxin treatment is the best method of restoring Dr. Macklin to sanity." "There is some degree of risk in shock treatments, too. But—" "It isn't quite the same, Colonel. Elliot Macklin has a history of vascular spasm, a mild pseudostroke some years ago. Now you want to Macklin," Mitchell interjected. "I'm no psychiatrist," Mitchell said, "but I think she wants Macklin

<question>:
Why do they want Macklin specifically to be the test subject?

<options>:
A As a fellow scientist, he'd understand and appreciate what they're doing.
B He's in relatively good health, meaning he'd survive the experiment and yield resutls.
C He is a man of great importance, and people will believe him if it works.
D He has chronic migraines, making him a good candidate.

<answer>:

C