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.

BEAR : QZDA :: DUST : SRTC :: GOLD : ?

CKNF

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

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

BEAR : QZDA :: DUST : SRTC :: GOLD : ?

The  logic followed here is :

B → (-1)→ A

E → (-1)→ D

A → (-1)→ Z

R → (-1)→ Q

ADZQ   REVERSE  QZDA

AND

D → (-1)→ C

U → (-1)→ T

S → (-1)→ R

T → (-1)→ S

CTRS   REVERSE   SRTC

SIMILARLY

G → (-1)→ F

O → (-1)→ N

L → (-1)→ K

D → (-1)→ C

FNKC   REVERSE  CKNF