Based on the position in the English alphabetical order, three of the following letterclusters are alike in some manner and one is different. Select the odd letter-cluster.

JHFA

THE LOGIC;

1) JHFA,

J → (-2) → H → (-2) → F → (-5) → A

2) MKHD,

M → (-2) → K → (-2) → H → (-4) → D

3) XVSO,

X → (-2) → V → (-2) → S → (-4) → O

4) NLIE,

N → (-2) → L → (-2) → I → (-4) → E

Thus, MKHD is the odd one.