Which reason completes the proof in the picture
A.alternate interior angles converse
B.opposite sides of a parallelogram are congruent
C.opposite angles of a parallelogram are congruent
D.alternate interior angles theorem
![Which reason completes the proof in the picture Aalternate interior angles converse Bopposite sides of a parallelogram are congruent Copposite angles of a paral class=](https://us-static.z-dn.net/files/d47/74f4f0e45904e7c5a659b3fd72fe2412.jpg)