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 r + 2 → 2nd, 2nd + 4 → Third letter

Option A: ACG

A + 2 → C

C + 4  → D 

Option B: SUY

S+ 2 → U

U + 4 → Y

Option C: BEH

B + 2 → D

E + 4  → I  not H 

Option D: FHL

F + 2  → H

H + 4 → L 

Thus, correct option is (c).