Correct Answer: VNBXCNB

Solution : Given:
MNB_CM_ _WCMNB_ _M_ _YC

To fill the series we have to divide the series – MNB_C / M_ _WC / MNB_ _ / M_ _YC

Let's check each option –
First option: VNBXCNB; MNB V C / M NB WC / MNB XC / M NB YC (The fourth letter in each part is increased by 1; MNBC is repeated in the series)
Second option: VNBYDNB ; MNB V C / M NB WC / MNB YD / M NB YC (No repeated pattern has been found)
Third option: WYYYCNB ; MNB W C / M YY WC / MNB YC / M NB YC (No repeated pattern has been found)
Fourth option: WNBYDNB ; MNB W C / M NB WC / MNB YD / M NB YC (No repeated pattern has been found)

So, the series becomes→MNBVCMNBWCMNBXCMNBYC. Hence, the first option is correct.