Which Is MOST Likely a Macroeconomic, Not Microeconomic, Question

Multiple Choice

Which is MOST likely a macroeconomic, not microeconomic, question?

A) Is the national unemployment rate rising or falling?
B) Are consumers buying more bottled water and less fruit juice?
C) Are salaries for nurses rising or falling?
D) Should a tax be levied on each ton of carbon dioxide a factory emits?