Which of the Following Is True

Multiple Choice

Which of the following is true?

A) Economists formulate a theory and then sometimes try to verify the theory with real-world observations.
B) Real-world observations are used to formulate an economic theory,but this is of little use to policymakers.
C) Once an economic theory is developed,it is rarely tested against real-world observations.
D) When a policymaker has an idea about how to advance economic growth,he or she will ask an economist to formulate a theory,and then this will be compared to real-world observations.
E) Real-world observations motivate economists to formulate theories about how economic growth evolves,and these theories are then used and reevaluated as new data become available.