Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.
TK_TKT_P_K_KPTK_K_TK

A

P, T, K, P, T, K

B

P, K, T, T, T, P

C

P, K, T, P, K, T

D

P, T, T, K, P, T