WILL GIVE BRAINIEST!!Complete the sentence with the phrase that makes the proof statement true.WXY is an isosceles triangle. Side WX and side YX are congruent A. because all of the sides of an isosceles triangle are congruent. B. by the definition of isosceles triangle. C. because vertical angles are congruent. D. and all of the angles of the triangle are congruent to each other as well.