Select the option that represents the letters that when placed from left to right in the blanks below will complete the letter series.

AA_D_F_AC_E_A_ _D_F_ACD_F

CEADFACEAE

After dividing it into groups  and comparing the corresponding term we, get "CEADFACEAE" as the repetitive term because it follows the pattern.

AA C D E F A AC D E F A AC D E F A ACD E F