ab __ d __ aaba __ na _ badna _ b

Question: ab __ d __ aaba __ na _ badna _ b
[A].

andaa

[B].

babda

[C].

badna

[D].

dbanb

Answer: Option A

Explanation:

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