Kathryn draws three pairs of intersecting lines. In each figure, she measures a pair of angles. What is a reasonable conjecture for Kathryn to make by recognizing a pattern and using inductive reasoning?

When a pair of lines intersect, the vertical angles are acute.

When a pair of lines intersect, the vertical angles are congruent.

When a pair of lines intersect, all of the angles formed are congruent.

When a pair of lines intersect, all of the angles formed are right angles.