Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
`a-aabb--ab-b-`

Options

A. b a a a a
B. b a b a b
C. b a a b a
D. b b a a a

Answer

C

Explanation

`a underlineb abs(a a b b)abs(underlinea underlinea ab underlineb b)underlinea`