Select the option that is related to the third letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster.

POK : HLM :: ORT : ?

QOL

A   B   C    D   E    F   G    H    I    J    K    L   M

 ↓    ↓    ↓    ↓    ↓     ↓   ↓    ↓     ↓   ↓    ↓    ↓    ↓

 Z   Y    X   W   V    U   T    S    R   Q   P    O   N

26  25  24  23  22  21  20  19  18  17  16  15  14

******************************************

POK : HLM :: ORT : ?

The  logic followed here is :

REVERSE THE ALPHABET PATTEN

POK = KOP

K → (-3) → H

O → (-3) → L

P → (-3) → M

SIMILARLY

ORT = TRO

T → (-3) → Q

R → (-3) → O

O → (-3) → L