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.

SON : TPO :: BRO : CSP :: BIL : ?

CJM

SON : TPO :: BRO : CSP :: BIL : ?

The logic followed here is :

S → (+1) → T

O → (+1) → P

N → (+1) → O

and

B → (+1) → C

R → (+1) → D

O → (+1) → P

Similarly

B → (+1) → C

I → (+1) → J

L → (+1) → M