Given: Lines 1 and 2 are parallel. Line 3 is a transversal.


Which statement justifies that ∠A ≅ ∠C:

A: If 2 parallel lines are cut by a transversal, then the corresponding angles are congruent.

B: If 2 parallel lines are cut by a transversal, then the alternate interior angles are
congruent.

C: If 2 alternate interior angles are congruent, then the lines that have been cut by a
transversal are parallel.

D: If 2 corresponding angles are congruent, then the lines that have been cut by a
transversal are parallel.