Sometimes the Government Varies Its Spending,depending on the Needs of the Country.Which

Multiple Choice

Sometimes the government varies its spending,depending on the needs of the country.Which economic principle does this statement BEST represent?

A) Resources should be used efficiently to achieve society's goals.
B) When markets don't achieve efficiency,government intervention can improve society's welfare.
C) The true cost of something is its opportunity cost.
D) Government policies can change spending.