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

D _ R X E C M R _ E _ M R X _ A M _ X E

M X B E R

After dividing it into groups  and comparing the corresponding term we, get "M X B E R" as the repetitive term because it follows the pattern.

D M R X E C M R X E B M R X E A M R X E