A Major Reason Why Healthcare Costs and Expenditures Are Lower

A major reason why healthcare costs and expenditures are lower in other westernized, industrial countries than in the United States, is that these countries

A) own their own hospitals and doctors and other providers work for the government.
B) pharmaceutical companies charge less for their products in these countries because they make so much from the U.S. market.
C) these other countries regulate prices.
D) all of the above.