question: Hint: Please answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
  Question: At Bloomington Consulting, the head of human resources examined how the number of employees with health care benefits varied in response to policy changes. According to the table, what was the rate of change between 2014 and 2015? (Unit: employees per year)
  Choices:
  (A) -1
  (B) 1
  (C) 0
  (D) -2