If a, b, and m are integers, then a and b are said to be

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If a, b, and m are integers, then a and b are said to be m-related if m is a factor of a – b. If 15 and –3 are m-related, which of the following could NOT be a value of m ?

A. 2
B. 3
C. 4
D. 6
E. 9


OA C

Source: GMAT Prep