In the given letter-cluster pairs, the first letter-cluster is related to the second letter-cluster following a certain logic. Study the given pairs carefully, and from the given options, select the pair that follows the same logic.

ON : NPMO

IN : HJMO

Correct option is D

Given ON : NPMO

First case:

ON : NPMO

O, is place in between N and P both and N, is placed in between M and O both according to the alphabetical series.

Second case:

IN : HJMO

I, is place in between H and J both and N, is placed in between M and O both according to the alphabetical series.

similarly, 

​$$\text{TO : SUNP}$$​
T, is place in between S and U both and O, is placed in between N and P both according to the alphabetical series.

Option d is correct answer.