A tree makes a shadow that is 14 ft long. Rachel is 6 ft tall. When she is standing near the tree, her shadow is 3.5 ft long. Which statement BEST explains why Rachel can use a proportion to estimate the length of the tree? A) The triangles made by the tree and its shadow and Rachel and her shadow are similar. B) The triangles made by the tree and its shadow and Rachel and her shadow are adjacent. C) The triangles made by the tree and its shadow and Rachel and her shadow are congruent. D) The triangles made by the tree and its shadow and Rachel and her shadow are symmetric.