The correct answer is: B. Public revenue and expenditure
Fiscal policy is the use of government revenue collection (taxation) and expenditure (spending) to influence the economy. The two main instruments of fiscal policy are taxation and government spending.
Taxation is a compulsory financial charge or some other type of levy imposed on a taxpayer (an individual or legal entity) by a governmental authority, typically to fund government spending and various public expenditures.
Government spending is the purchase of goods and services by a government. It is usually included in the gross domestic product (GDP) as part of the final consumption expenditure.
Export and import are the two main components of international trade. Export is the sale of goods and services by a country to other countries. Import is the purchase of goods and services by a country from other countries.
Issue of currency is the process of creating new money. It is usually done by a central bank.
Control of population is the process of regulating the size and growth of a population. It is usually done by government policies.
In conclusion, fiscal policy is related to public revenue and expenditure. It is a tool that governments use to influence the economy.