. Which is the best statement of the angle-angle similarity theorem?

A. When the preimage of a triangle is a dilation of the image, the triangles are similar.
When triangles have two pairs of corresponding angles that are congruent, the third pair of angles is also congruent.

B. When triangles have two pairs of corresponding angles that are congruent, those triangles are similar.

C. When the interior angles of a polygon sum to 180 degrees that polygon is a triangle.