Answer: Option (b) is correct.
Step-by-step explanation:
According to the theory of comparative advantage, a country has a comparative advantage in producing a commodity if the opportunity cost of producing that commodity in terms of other commodity is lower in that country as compared to the other country.
Hence, a country exports the commodity in which it has a comparative advantage and imports the commodity in which it has a comparative disadvantage because the opportunity cost of producing these commodities is higher than the other country.