Macroeconomics is the study of the economy as a whole while microeconomics deals with the individual decision-making units.
(Option A) is the right answer
Step-by-step explanation:
Microeconomics is taken from the Greek prefix called "mikro" which means "small". This is one of the branches of economics which talks about the study of behavior of individuals and firms in making decisions regarding the allocation of scarce resources. It also deals with the interactions among these individuals and firms.
Macroeconomics deals with "large-scale or general economic factors"
It is the study of "National economy"
Eg. Aggregate supply, Aggregate demand , Inflation.