Choose the odd one out.

AEFJ
EHIL
KOPT
UYZD

The answer is C. KOPT.

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

A. AEFJ: A, B, C, D, E, F, G, H, I, J.
B. EHIL: E, F, G, H, I, J, K, L.
D. UYZD: U, V, W, X, Y, Z.