The following is an incomplete paragraph proving that ∠wrs ≅ ∠vqt, given the information in the figure where segment uv is parallel to segment wz.:

segments uv and wz are parallel with line st intersecting both at points q and r respectively

according to the given information, segment uv is parallel to segment wz while angles squ and vqt are vertical angles. angle vqt is congruent to angle squ by the vertical angles theorem. because angles squ and wrs are corresponding angles, they are congruent according to the corresponding angles postulate. finally, angle vqt is congruent to angle wrs by the

which property of equality accurately completes the proof?

reflexive
substitution
subtraction
transitive