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