a _ n _ b _ _ ncb _ _ ncb

Question: a _ n _ b _ _ ncb _ _ ncb
[A].

abbbec

[B].

abebeb

[C].

bacbab

[D].

bcabab

Answer: Option D

Explanation:

The series is abncb/abncb/abncb. Thus, the pattern ‘abncb’ is repeated.