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: Pattern are +2, -5 in English alphabet.

Let's analyze the options:

Option (a): KNG  (Pattern Not follow)
K + 3 = N; N - 7 = G → (+3, -7)
​Option (b): PRM
P + 2 = R; R - 5 = M → (+2, -5)
​Option (c): EGB
E + 2 = G; G - 5 = B → (+2, -5)
​Option (d): GID
G + 2 = I; I - 5 = D → (+2, -5)

Odd One Out: Option (a) KNG does not follow the same logic as other options follow to making it odd one out.

Thus, the correct option is (a) KNG.