Based on the English alphabetical order, three of the following four letter-clusters are alike in a certain way and thus form a group. Which letter-cluster 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 - 5 = 2nd letter, 2nd letter - 3 = 3rd letter and 3rd letter - 5 = 4th letter

Now, we check each options.

Option (a): VQNI (Follow)

V - 5 = Q, Q - 3 = N, N - 5 = I

Option (b): PKHC (Follow)​

P - 5 = K, K - 3 = H, H - 5 = C

Option (c): MHEZ (Follow)​

M - 5 = H, H - 3 = E, E - 5 = Z

Option (d): EZVR (Not Follow)​

E - 5 = Z, Z - 3 $$\neq$$ V, V - 5 $$\neq$$ R​

Thus, correct option is (d).