PLS ANSWER ASAP Mackenzie wrote the following paragraph proof for the Vertical Angles Theorem: shown in picture below The sum of angle 1 and angle 4 and the sum of angle 3 and angle 4 are each equal to 180 degrees by the definition of supplementary angles. The sum of angle 1 and angle 4 is equal to the sum of angle 3 and angle 4 _. Angle 1 is equal to angle 3 by the subtraction property of equality. Which phrase completes the proof? A)by construction using a straightedge B)by the definition of a perpendicular bisector C)by the transitive property of equality. D)by the vertical angles theorem