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

Lines A and B are parallel. ________ because they form a linear pair.

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

Fill in the blank with the phrase that makes the proof statement true Lines A and B are parallel because they form a linear pair A Angle 1 is supplementary to a class=