question: Hint: Please answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
  Question: 如图，△ABC中，AD平分∠BAC，AD交BC于点D，DE⊥AB，垂足为E，若DE＝3，AC＝4，则△ADC的面积为（）
  Choices:
  (A) 3
  (B) 4
  (C) 5
  (D) 6