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

A

t, n, p, g, n, t, g

B

t, n, p, g, g, n, t

C

t, p, n, n, g, g, t

D

t, p, n, g, n, g, t