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 + 8 = 2nd letter and 2nd letter + 8 = 3rd letter

Now, we check each options.

Option (a): NVD (Follow)

N + 8 = V, V + 8 = D

Option (b): MVC (Not Follow)​

M + 8 $$\neq$$ V, V + 8 $$\neq$$ C​

Option (c): OWE (Follow)​

O + 8 = W, W + 8 = E

Option (d): KSA (Follow)​

K + 8 = S, S + 8 = A

Thus, correct option is (b).