Choose the odd one out.

ACHI
DFKL
MNST
OQVW E. PRWX

The answer is D. OQVW.

In each of the other options, the letters are in alphabetical order. In D, the letters are not in alphabetical order.

A. ACHI – A, C, H, I are in alphabetical order.
B. DFKL – D, F, K, L are in alphabetical order.
C. MNST – M, N, S, T are in alphabetical order.
E. PRWX – P, R, W, X are in alphabetical order.