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.

GAIN : HBKP :: ACHE : BDJG :: CAKE : ?

DBMG

GAIN : HBKP :: ACHE : BDJG :: CAKE : ?

The logic followed here is :

G → (+1) → H

A → (+1) → B

I  → (+2) → K

N → (+2) → P

And

ACHE : BDJG

A → (+1) → B

C → (+1) → D

H → (+2) → J

E → (+2) → G

Similarly

CAKE : ?

C → (+1) → D

A → (+1) → B

K → (+2) → M

E → (+2) → G