question: Hint: Please answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
  Question: In how many years, is the volume of the air carriers in Ethiopia greater than the average volume of the air carriers in Ethiopia taken over all years ?
  Choices:
  (A) 3
  (B) 1
  (C) 2
  (D) 4