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

Let’s check the options:
Logic: 1st letter − 6 = 3rd letter, 2nd letter − 5 = 4th letter.

Option A: MP → GK
M − 6 = G
P − 5 = K
Option B: PS → JM
P − 6 = J
S − 5 = N, not M (pattern breaks here)
Option C: JM → DH
J − 6 = D
M − 5 = H
Option D: TW → NR
T − 6 = N
W − 5 = R
Only option B does not follow the pattern, making B odd one out
Thus, the correct option is (B) PS-JM.