【单选题】With respect to how economists study the economy, which of the following statements is most accurate?
A.
Economists study the past, but they do not try to predict the future.
B.
Economists use “rules of thumb” to predict the future.
C.
Economists devise theories, collect data, and yze the data to test the theories.
D.
Economists use controlled experiments in much the same way that biologists and physicists do.