Answer:
d. Mexico has nothing to gain from importing United States pork.
Step-by-step explanation:
The principle of comparative advantage asserts that countries (in this case Mexico) are better off importing certain goods (in this case pork), given that the opportunity cost of importing such goods are less in comparison to the production costs of manufacturing them within the country.
By definition, a country is said to have a comparative advantage over another, when they can produce a certain good or service at a lower marginal or opportunity cost.