What kind of advantage does a country have if it can make a product more efficiently?

The correct answer is D. An absolute advantage.

An absolute advantage occurs when a country can produce a good or service more efficiently than another country, meaning it can produce more output with the same amount of resources or produce the same amount with fewer resources. This efficiency allows the country to create products at a lower cost and potentially offer lower prices in the market, leading to increased competitiveness in trade.