In alphabet series, some alphabets are missing which are given in that order as one of the alternatives below it. Choose the correct alternative.
b _ abbc _ bbca _ bcabb _ ab
_ bbca _ bcca _ ac _ a _ cb
_ bc _ _ bb _ aabc
_ _ aba _ _ ba _ ab
abca _ bcaab _ ca _ bbc _ a
_ abb _ _ bb _ a _ bbab _ ba