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 is the letter-cluster pair that 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.)​

​Logic: 1st - 1 = 3rd, 2nd - 1 = 4th 

Option A: PS - OR

P - 1 = O

S - 1 = R
Option B: HK - GJ

H - 1 = G 

K - 1 = J 
Option C: JH - KL

J - 1 = I ≠  K
H - 1 = J ≠ L​

Option D: LO - KN

L - 1 = K 

O - 1 = N 
The odd one out is Option C (JH - KL), as it doesn't follow the same pattern.