Which of the following must be true in order to engage in advantageous international trade?

• A.It must have an absolute advantage in producing one good being traded.
• B.It must be producing at a point on its production possibilities frontier.
• C.It must have a comparative advantage in producing one of the goods being traded.
• D.There must be no potential Pareto improvements available in the economy.
• E.It must be economically efficient.