The following is an incomplete paragraph proving that the opposite angles of parallelogram abcd are congruent according to the given information, ab = dc and bc ad using a straightedge, extend segment ab and place point p above point b. by the same reasoning, extend segment ad and place point to the left of point a angles bcd and pbc are congruent by the alternate interior angles theorem angles pbc and bad are congruent by the corresponding angles theorem. by the property of equality, angles bcd and bad are congruent. angles abc and bat are congruent by the alternate interior theorem. angles bat and cda are congruent by the corresponding angles theorem. by the _property of equality, zabc is congruent tozcda consequently, opposite angles of parallelogram abcd are congruent what properties accurately complete the proof? select one a) 1. addition 2. transition b) 1. reflexive 2. reflexive c) 1. substitution 2. reflexive d) 1. transitive 2. transitive