If n is an odd integer, which of the following must also be an odd integer?
(A) 2n
(B) 2n^2
(C) n^2 + 2n
(D) n^2 + 3n
(E) n^2 + 2n + 3
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(A) 2n
(B) 2n^2
(C) n^2 + 2n
(D) n^2 + 3n
(E) n^2 + 2n + 3
