Give a quick stream of consciousness before answering the following question. If a and b are unique prime integers, which of the following must be even?\nOptions:\n(A) a−b\n(B) a−2b\n(C) 2a−2b\n(D) 2a−b\n(E) ab^2
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Let's assume that a is an even prime integer and b is an odd prime integer, their subtraction results in an odd integer and an odd integer multiplied by an even integer yields an even integer.
The answer: (C).
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