In a nationwide poll, N people were interviewed.If \frac{1}{4} of them answered "yes" to question 1, and of those, \frac{1}{3} answered "yes" to question 2, which of the following expressions represents the number of people interviewed who did not answer "yes" to both questions?
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A\frac{N}{7}
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B\frac{6}{7}N
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C\frac{5}{12}N
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D\frac{7}{12}N
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E\frac{11}{12}N
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正确答案: E