In each of the following questions, various terms of an alphabet series are given with one or more terms missing as shown by (?). Choose the missing terms out of the given alternatives.
ab_aa_bbb_aaa_bbba

Options

A. abba
B. baab
C. aaab
D. abab

Answer

B

Explanation

The series is abb/aaabbb/aaaabbbb/a.Thus, the are repeated twice, then thrice, then four times and so on.