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.)
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Logic: The Pattern are +4, -3 In English alphabet.

Let's check all the options:

Option (a): TXV  (Different Pattern)
T + 4 = X
X - 2 = V
​Option (b): JNK
J + 4 = N
N - 3 = K
​Option (c):EIF
E + 4 = I
I - 3 = F
​Option (d): OSP
O + 4 = S
S - 3 = P

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

Thus, the correct option is (a) TXV