Choose the odd one out.

APoQ
DXeM
SFiK
OWjB E. CquL

The odd one out is C. SFiK.

All the other options have the first and third letters in alphabetical order.

A. APoQ – A comes before P and Q comes after O.
B. DXeM – D comes before E and M comes after X.
D. OWjB – O comes before W and J comes after B.
E. CquL – C comes before Q and L comes after U.

In C. SFiK, S comes before F and I comes after K.