question: Hint: Please answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
  Question: Mrs. Zimmerman hosts an annual art contest for kids, and she keeps a record of the number of entries each year. According to the table, what was the rate of change between 2013 and 2014? (Unit: entries per year)
  Choices:
  (A) 4
  (B) 5.5
  (C) 7
  (D) 7.5