Answer:
B The United States has comparative advantage in salmon production, and Peru has comparative advantage in anchovy production.
Step-by-step explanation:
For the exchange to be based upon relative per-unit opportunity costs, there is need for one of the countries to be at a comparative advantage in one of the products.
This offer them the opportunity to be at the deciding factor on which countries they would like to trade with. From the scenario, it shows that United States and Peru both have comparative advantage with the different products which they are trading with each other.