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

K a _ _ N _ a K _ R a _ K a _a R _ N K a

R a K a N K a

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

K a Ra N K a K a R a N K a K R a N K a