Two triangles each have an angle of measure x and an angle of measure y. Which statement about the measure of the remaining angles is true?

A. The two angles are congruent. Their measure is x + y

B. The two angles are congruent. Their measure is (180 - x) + (180 - y)

C. The two angles are congruent. Their measure is 180 - x - y

D. The two angles are not necessarily congruent. Their measures could be different