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.)​

Logic: 1st letter + 8 = 3rd letter and 2nd letter + 10 = 4th letter

Now, we check each options.

Option (a): TL – BV (Follow)

T + 8 = B, L + 10 = V

Option (b): PH – XR (Follow)​

P + 8 = X, H + 10 = 18

Option (c): GY – OJ (Not Follow)​

G + 8 = O, Y + 10 $$\neq$$ J​

Option (d): ZR – HB (Follow)​

Z + 8 = H, R + 10 = B

Thus, correct option is (c).