Explanation:

Given option (A) NVH-KUK (C) REA-ODD (D) TXB-QWE
the above three option follow the same pattern
we know that alphabet position A=1, B=2, C=3, D=4 ...... Z=26
we represent the given option in the alphabet position
(A) 14 22 8 - 11 21 11 in this option the pattern is going on first -3 alphabet position decrease, the second is -1 alphabet position is
decrease and third is increases + 3 alphabet position.
(C) 18 5 1 - 15 4 4 in this option the pattern is going on first -3 alphabet position decrease, the second is -1 alphabet position is
decrease and third is increased + 3 alphabet position.
(D) 20 24 2-17 23 5 in this option the pattern is going on first -3 alphabet position decrease, the second is -1 alphabet position is
decrease and third is increases + 3 alphabet position.
above three option is follow the same pattern from the above line but option (B) is not follow that pattern
(B) CWX -AVZ represents in the alphabet position form 3 23 24 - 1 22 26 it is going on in this option the pattern is going on first -2
alphabet position decrease, the second is -1 alphabet position is decrease and third is increased + 2 alphabet position.
then therefore option (B ) is different from another option.
therefore (B) CWX-AWZ