Three of the following four pairs of letter cluster are alike in a certain way and one is different. Select the odd one.

Given option (B), (C), (D) is the pair opposite of the alphabet 

(B) BFX-YUC

in this option B opposite alphabet Y, F opposite alphabet U, and X opposite alphabet C

then the BFX-YUC

Option (C) PHJ-KSQ

In the option P opposite alphabet K, H opposite alphabet S and J opposite alphabet Q

Option (D) RTV-IGE

in the option R opposite alphabet I, T opposite alphabet G and V opposite alphabet E 

from the above B, C, D follows the same pattern 

Option (A) OPR-JKL is different it does not follow the opposite alphabet 

therefore option (A) OPR-JKL Ans