In alphabet series, some alphabets are missing which are given in that order as one of the alternatives below it. Choose the correct alternative.
a _ abbb _ ccccd _ ddccc _ bb _ ba
_ bc _ _ bb _ aabc
c _ bbb _ _ abbbb _ abbb _
ba _ b _ aabb _ a _ _ a _ bb
ccbab _ caa _ bccc _ a _
b _ b _ bb _ _ bbb _ bb _ b