Use the following image to answer the question.
Four angles formed by intersecting lines m and n. Angles are labeled clockwise from left: angle 1, angle 2, angle 3, and angle 4.

What statement can be used to prove that vertical angles ∠1 and ∠3 are congruent?

A.) m∠1+m∠3=m∠2+m∠4
B.) m∠1=m∠2 and m∠2=m∠3
C.) m∠1+m∠2=m∠2+m∠3
D.) m∠1=m∠4 and m∠2=m∠3