Which of the following is the best definition of economics?
a. It is the study of being boring.
b. The study of how to allocate an unlimited amount of resources.
c. The study of decision-making of how to allocate scarce resources by individual persons and firms.
d. The study of decision-making of how to allocate scarce resources.
e. The study of decision-making of how to allocate scarce resources at the national level.