Odd and Even

If m m is odd and nn is even, which of the following is definitely an even number?

A.  m2+n\ m^2 + n
B.  m2+mn\ m^2 + mn
C.  m2+n2\ m^2+n^2
D.  m+n2\ m+ n^2
E.  mn+n2\ mn + n^2

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