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

CAM : EES :: OAT : QEZ :: TOI : ?

VSO

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

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

CAM : EES :: OAT : QEZ :: TOI : ?

The  logic followed here is :

C → (+2) → E

A → (+4) → E

M → (+6) → S

AND

O → (+2) → Q

A → (+4) → E

T → (+6) → Z

SIMILARLY

T → (+2) → V

O → (+4) → S

I → (+6) → O