question: Hint: Please answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
  Question: An author recorded how many words she wrote in the past 3 days. How many words in total did the author write on Thursday and Friday? (Unit: words)
  Choices:
  (A) 456
  (B) 567
  (C) 679
  (D) 789