question: Hint: Please answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
  Question: The figure above is composed of 25 small triangles that are congruent and equilateral. If the area of triangle DFH is 10, what is the area of triangle AFK?
  Choices:
  (A) 40
  (B) 42.5
  (C) 50
  (D) 62.5