Select the combination of letters that when sequentially placed in the blanks of the given letter series will complete the series.
Z H _ O R C _ _ K _ R _ Z H _ O _ C

A

Z, H, K, O, C, K, R

B

K, Z, H, K, R, K, R

C

K, Z, H, O, C, K, R

D

K, Z, O, R, C, K, R