In alphabet series, some alphabets are missing which are given in that order as one of the alternatives below it. Choose the correct alternative.
_ _ babbba _ a _ _
_ baa _ aab _ a _ a
_ abb _ _ bb _ a _ bbab _ ba
_ bc _ _ bb _ aabc
ba _ b _ aabb _ a _ _ a _ bb
abb _ baa _ a _ bab _ aba