Based on the English alphabetical order, three of the following four letter-cluster pairs are alike in a certain way and thus form a group. Which letter-cluster pair DOES NOT belong to that group? (Note: The odd one out is not based on the number of consonants/vowels or their position in the letter cluster)​

Correct option is B

Logic: = Letter1 + 2 = Letter2
Explanation (Option-wise):
(A) HL → JN
H + 2 = J
L + 2 = N

(B) MU → KH
M → K => –2
U → H => –13

So this seems suspicious.
(C) NR → PT
N + 2 = P
R + 2 = T

(D) SW → UY
S + 2 = U
W + 2 = Y

Final Answer:
All options except (B) follow a consistent (+2, +2) pattern.
Option (B) does not follow the same logic.

Final Correct Option: (B) MU – KH