If $n$ is a positive integer, which of the following must be even?

If $n$ is a positive integer, which of the following must be even?

A. $(n − 1)( n + 1)$
B. $(n − 2)( n + 1)$
C. $(n − 2)( n + 4)$
D. $(n − 3)( n + 1)$
E. $(n − 3)( n + 5)$

OA B

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