According to the principle of comparative advantage,

• A. 7countries should specialize in the production of goods that they enjoy consuming.
• B. countries should specialize in the production of goods for which they have a lower opportunity cost of production than their trading partners.
• C. countries with a comparative advantage in the production of every good need not specialize.
• D. countries should specialize in the production of goods for which they use fewer resources in production than their trading partners.