_ a _ b _ abaa _ bab _ abb

Question: _ a _ b _ abaa _ bab _ abb
[A].

aaabb

[B].

ababb

[C].

babab

[D].

babba

Answer: Option D

Explanation:

The series is baa/bba/baa/bba/baa/bb. Thus, the pattern baa/bba is repeated.