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, it is known that AB = 6.0, BC = 9.0, ∠B = 30.0, then the area of ​​the parallelogram ABCD is ()
  Choices:
  (A) 12
  (B) 18
  (C) 27
  (D) 54