Every Monday, either the math department chair or the members of the department post a challenge problem to the student body, but usually it is so difficult that they cannot solve it in a week's time.
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Aeither the math department chair or the members of the department post a challenge problem to the student body, but usually it is so difficult that they
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Beither the math department chair or the members of the department post a challenge problem to the student body, but usually the problem is so difficult that the students
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Ceither the math department chair or the members of the department posts a challenge problem to the student body, but usually the problem is so difficult that they
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Deither the members of the math department or the department chair posts a challenge problem to the student body, but usually it is so difficult that they
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Eeither the members of the math department or the department chair post a challenge problem to the student body, but usually the problem is so difficult that the students
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正确答案: B