Correct option is B
NY: N and Y have a difference of 11 positions in the alphabet (N=14, Y=25).
BL: B and L have a difference of 10 positions (B=2, L=12).
LW: L and W have a difference of 11 positions (L=12, W=23).
CN: C and N have a difference of 11 positions (C=3, N=14).
Upon observation, three of the pairs (NY, LW, CN) have a difference of 11 positions, while BL has a difference of 10.
Thus, the odd one is (b) BL.