If $x$ is an integer, which of the following must be an even integer?

If $x$ is an integer, which of the following must be an even integer?

A. $(x+1)^2$
B. $(x+1)(x+2)$
C. $(x+1)(x+3)$
D. $(x+2)^2$
E. $(x+2)(x+4)$

OA B

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