Fill in the blank with the phrase that makes the proof statement true.

Lines A and B are parallel. Angle 1 is congruent to angle 3 by the Corresponding Angles Postulate. Angle 1 is supplementary to angle 2 because they form a linear pair. _ by the Substitution Property.

A. Angle 3 is congruent to angle 2
B. Angle 1 is congruent to angle 2
C. Angle 3 is supplementary to angle 2
D. Line A is parallel to line B