Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it ?

_ ab _ b _ aba _ _ abab.

A. abbaa
B. bbaab
C. abaab
D. aaaba

Also Read:

• a_bbc_aab_cca_bbcc
• _ bc _ ca _ aba _ c _ ca
• _ ab _ b _ aba _ _ abab.