A. 1

B. 3

C. 4

D. 7

E. 14

The OA is B

**Source: Princeton Review**

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The pair of positive integers with a product of 28 could be {1, 28}, {2, 14}, and {4, 7}, with differences of 27, 12, and 3, respectively. Since 3 is the only difference given in the answer choices, choice B is the correct answer.

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