GFEH : RQPS :: LKJM : ?

The logic here is

G opposite is R

The first letter of 2nd letter cluster is opposite letter of first letter of 1st letter cluster. Similarly, The first letter of 4th letter cluster should be opposite letter of first letter of 3rd letter cluster.

L opposite is O

$$\Rightarrow$$  First letter of 4th letter cluster is O

The pattern of letters within letter clusters are

G - 1 = F

F - 1 = E

E + 3 = H

Also,

R - 1 = Q

Q - 1 = P

P + 3 = S

Using the same logic for 4th letter cluster

O - 1 = N

N - 1 = M

M + 3 = P

The fourth letter cluster is ONMP

$$\therefore\ $$ONMP is related to LKJM in the same RQPS is related to GFEH.

Hence, the correct answer is Option B