Which Statement Below Best Illustrates the "Art," Rather Than the "Science

Multiple Choice

Which statement below best illustrates the "art," rather than the "science," of macroeconomics?

A) Macroeconomic data provide the motivation for new macroeconomic theory.
B) Macroeconomic relationships can be expressed using symbols and equations.
C) Macroeconomists must determine which simplifying assumptions clarify our thinking and which ones mislead us.
D) Graphs and charts can be used to illustrate the history of macroeconomic variables.