Based on the diagram, which statement is true? A The measure of an exterior angle of a triangle, angle C, is equal to the sum of the measures of the two non-adjacent interior angles of the triangle, angle A and angle B. B The sum of the measures of the interior and exterior angles of a triangle is always 180°. C The measure of an exterior angle of a triangle, angle C, is less than the sum of the measures of the two non-adjacent interior angles of the triangle, angle A and angle B. D The sum of the measures of the interior and exterior angles of a triangle is always 360°.