If c and d are unique prime integers, which of the following must be even?\nOptions:\n(A) c−d\n(B) 2c−2d\n(C) c−2d\n(D) 2c−d\n(E) cd^2 Think first, then make a decision. Some random thoughts:
User
Any number multiplied by 2 has to be an even number So the answer is (B).
Assistant