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 - 4 = 2nd letter and 2nd letter + 7 = 3rd letter

Now, we check each options.

Option (a): SOV (Follow)

S - 4 = O, O + 7 = V

​Option (b): EAG (Not Follow)​

E - 4 = A, A + 7 $$\neq$$ G​

Option (c): IEL (Follow)​

I - 4 = E, E + 7 = L

Option (d): NJQ (Follow)​

N - 4 = J, J + 7 = Q

Thus, correct option is (b).