A letter series is given below in which some letters are missing. Select the option that gives the letters that can fill these blanks in that order.

b_ba_mb_bm_abmb_bmb_bm_c

mbcbcac

The given series is b_ba_mb_ / bm_abmb_ / bmb_bm_c

On observing it closely, we can complete the series as: bmbabmbc / bmbabmbc / bmbabmbc

So, mbcbcab