Based on the English alphabetical order, three of the following four letter-cluster pairs are alike in a certain way and thus for a group. Which pair does not belong to that group?

(Note: The odd one out is not based on the number of consonants/vowels or their positions in the letter-cluster.)

P → X: The difference between P (16) and X (24) is +8.

V → R: The difference between V (22) and R (18) is -4.

So, the transformation pattern is (+8, -4).

D → L: The difference between D (4) and L (12) is +8.

J → F: The difference between J (10) and F (6) is -4.

The transformation pattern is (+8, -4).

C → M: The difference between C (3) and M (13) is +10.

H → R: The difference between H (8) and R (18) is +10.

The transformation pattern is (+10, +10).

G → O: The difference between G (7) and O (15) is +8.

M → I: The difference between M (13) and I (9) is -4.

The transformation pattern is (+8, -4).

Options A, B, and D follow the same transformation pattern: (+8, -4).

Option C has a different transformation pattern: (+10, +10).