Concept:Fiscal policy refers to the use of government revenue and spending tools to influence the economy.
Explanation:Government revenue includes taxes, fees, and other income collected by the state.
Government expenditure covers spending on public services, infrastructure, and welfare.
By adjusting these two components, the government can control inflation, unemployment, and aggregate demand.
Fiscal policy measures therefore involve changes in both revenue and expenditure, not taxation or spending alone.
Answer:D. government revenue and expenditure to regulate an economy.