Correct Answer: FBJL

Solution : Let's check the options –

First option: FBJL; The letters F, B, J, and L are not arranged in alphabetical order.
Second option: DKRW; The letters D, K, R, and W are arranged in alphabetical order.
Third option: CNPT; The letters C, N, P, and T are arranged in alphabetical order.
Fourth option: KNXY; The letters K, N, X, and Y are arranged in alphabetical order.

So, the first option differs from the other three options as letters are not in alphabetical order. Hence, the first option is correct.