Correct Answer: bmmc

Solution : Given:
mc_bcm_cbbc_m_bbcm

To fill the series, we have to divide the series – mc_bcm / _cbbc_ / m_bbcm
Let's check the options –
First option: mccb; mc m bcm / c cbbc c / m b bbcm (No repeated pattern found.)
Second option: bcmb; mc b bcm / c cbbc m / m b bbcm (No repeated pattern found.)
Third option: cbmb; mc c bcm / b cbbc m / m b bbcm (No repeated pattern found.)
Fourth option: bmmc; mc b bcm / m cbbc m / m c bbcm (mcbbcm is repeated in the series.)

So, the series becomes mcbbcmmcbbcmmcbbcm. Hence, the fourth option is correct.