What is the reason for statement 2 of the two-column proof? a) linear pair postulate b) definition of angle c) definition of bisect d) angle addition postulate

The reason for statement 2 is: Angle Bisector Postulate. By definition, an angle bisector is a ray that is drawn at the center of the angle. When an angle bisector is drawn, it divides the angle into two equal parts. So, the individual angles ∠RPQ and ∠QPS must be equal.