Professor A wanted to examine the popularity of various books in the London area. So he went to a number of libraries and bookstores where he measured the amount of dust on each of the books. He assumed that the more dust, the less often the book was picked up. In this example, Professor A has used

A. a confounded measure
B. a reliable measure
C. a random variable
D. an unobtrusive measure
E. an internally valid measure

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