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

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

Now, we check each  options.

Option (a): VD – TG (Follow)

V - 2 = T, D + 3 = G

Option (b): DR – BU (Follow)​

D - 2 = B, R + 3 = U

Option (c): WK – SG (Not Follow)​

W - 2 $$\neq$$ S, K + 3 $$\neq$$​ G

Option (d): ZX – XA (Follow)​

Z - 2 = X, X + 3 = A

Thus, correct option is (c).