Correct Answer: YBZA

Solution : Given:

AZB _, AZ _ Y, A _BY, _ ZBY

Let's check the given options –

First option: YBZA

The series becomes AZB Y , AZ B Y, A Z BY, A ZBY

The pattern in the series becomes AZB Y / AZ B Y /  A Z BY / A ZBY

Second option: BYAZ

The series becomes AZB B , AZ Y Y, A A BY, Z ZBY

There is no pattern in the above series.

Third option: BZYA

The series becomes AZB B , AZ Z Y, A Y BY, A ZBY

There is no pattern in the above series.

Fourth option: AZBY

The series becomes AZB A , AZ Z Y, A B BY, Y ZBY

There is no pattern in the above series.

Hence, the first option is correct.