Answer:
The correct answer is: the ability to produce a good or service at a lower opportunity cost than another.
Explanation:
Comparative advantage implies the ability to produce a good at lower opportunity cost. Opportunity cost is the cost of giving up the alternative.
A nation is considered to be enjoying a comparative advantage in the production of a good if it can produce the good at a relatively lower opportunity cost than other nations.
A nation is said to be specializing in the production of a commodity if it has a comparative advantage in production.