question: Hint: Please answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
  Question: As shown in the figure, D and E are the points on the edges AB and AC of △ABC, DE ∥ BC, if AD:DB=1.0:3.0, AE = 2.0, then the length of AC is ()
  Choices:
  (A) 10
  (B) 8
  (C) 6
  (D) 4