Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.
Q _ A D _ R _ K A D P _ Q K A _ P R Q K _ D _ R

A

K, P, Q, R, D, A, P

B

K, P, Q, R, D, A, Q

C

K, P, R, Q, D, A, P

D

K, P, Q, R, A, D, P