Economics as a course is divided into two major sub specialties, which are micro and macro economics. Micro economics has to do with the study of individual, households and businesses behaviors in decision making and uses of scarce resources. Macro economics on the other hand has to do with the study of how the whole economy behaves. Thus, macro economics is the study of how a nation's economy work and this usually involves the national government.
I think the correct answer from the choices listed above is option B. Macroeconomics focus on businesses. It is a branch of economic that studies the behavior of economy as a whole which is examined by inflation, price level, GDP or unemployment.
