Answer:
C. Governments have a difficult time fine-tuning the economy by using fiscal policy because there are several time lags and these are often variable.
Step-by-step explanation:
Fiscal policy includes two important tools, one is taxation and the other is government spending, the balance of which is essential for the sustainable economy, however the collection of expected tax and the nature of spending (also include the priorities) takes time and certain variable factors e.g. economic growth (GDP), employment, inflation, etc makes it difficult for the government to fine tune the economy.