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

B E _ K D F _ H K D J E H _ D _ E H K D

H E K N

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

B E H K D F E H K D J E H K D N E H K D