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A student was study the political party preference of a university's student population. The survey instrument asked student to identify themselves as a democrat or a republican. This question is flawed because:

A. students generally don't know their political preferences.

B. the categories are generally mutually exclusive.

C. the catergories are not exhaustive.

D. political preference is a continuous variable.

I vote for C because the survey doesn't include independents or third parties.

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