Choose the odd one out.

RUX
GJM
YBE
ZCF E. NPS

The answer is C. YBE.

The other options, A, B, D, and E, all have two letters that are in alphabetical order. For example, in A, R is the first letter of the alphabet and U is the second letter. In B, G is the seventh letter of the alphabet and J is the tenth letter. In D, Z is the twenty-sixth letter of the alphabet and C is the third letter. In E, N is the fourteenth letter of the alphabet and P is the sixteenth letter.

In C, Y is the twenty-fifth letter of the alphabet and B is the second letter. This is not in alphabetical order.