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.