Answer:
A. Country B has a comparative advantage producing copper.
Step-by-step explanation:
Comparative advantage is the capability of a firm or country to produce a good or service at a lower opportunity cost than rivals. It implies the country uses fewer resources to produce that commodity. Comparative advantage enables a country to have a higher output while using the same inputs as its competitors.
Country B can produce 400 tons of copper, while country A ability is 300 tons. Country B uses labor and materials more efficiently in copper production; hence it has a comparative