Which of the following statements BEST proves that ∠XWY ≌ ∠ZYW?

A.
If two parallel lines are cut by a transversal, then corresponding angles are congruent.

B.
If two parallel lines are cut by a transversal, then complementary angles are congruent.

C.
If two parallel lines are cut by a transversal, then alternate interior angles are congruent.

D.
If two parallel lines are cut by a transversal, then alternate exterior angles are congruent.