What reason can be used to prove that m is parallel to n? A. If a pair of vertical angles is congruent, then the lines forming them are parallel. B. If a pair of angles formed by a transversal is corresponding and supplementary, then the two lines are parallel. C. If a pair of angles is congruent and the sun of their measures is 180, then the lines forming the angles are parallel. D. If two lines are intersected by a transversal, and a pair of corresponding angles are congruent, then the two lines are parallel