question: Hint: Please answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
  Question: For an economics project, Colleen determined the cost of ferry rides for bicycles and cars. How much higher is the fare for a car on the Mukilteu-Clinton ferry than on the Southport-Fort Fisher ferry? (Unit: $)
  Choices:
  (A) 0
  (B) 1
  (C) 2
  (D) 4