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

P, D, C, D, T, G, T P, C, T, D, G, T, D P, D, D, C, G, T, T P, T, T, D, D, C, G

P, D, C, D, T, G, T

G P C T D / G P C T D / G P C T D / G P C T D P , D , C , D , T , G , T