Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series.kb_fg_k_df_tkbd_gtkbdf_t

• A. d, t, g, f, b, g
• B. d, t, b, g, f, g
• C. t, d, g, b, g, f
• D. t, d, b, g, f, g