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, in the parallelogram ABCD, CE bisects ∠BCD and it intersects the AD edge at point E, and DE = 3.0, then the length of AB is ()
  Choices:
  (A) 1
  (B) 2
  (C) 3
  (D) 6