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.

REAS : SGDW :: ABRO : BDUS :: MOBI : ?

NQEM

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

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

REAS : SGDW :: ABRO : BDUS :: MOBI : ?

The  logic followed here is :

R → (+1) → S

E → (+2) → G

A → (+3) → D

S → (+4) → W

AND

A → (+1) → B

B → (+2) → D

R → (+3) → U

O → (+4) → S

SIMILARLY

M → (+1) → N

O → (+2) → Q

B → (+3) → E

I → (+4) → M