question: Hint: Please answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
  Question: A taxi cab driver tracked how many miles he drove each month. How many miles did the taxi cab driver drive in total in January and April? (Unit: miles)
  Choices:
  (A) 8773
  (B) 7873
  (C) 7833
  (D) 7777