Answer:
A. the nation has a comparative advantage in producing steel and would become a steel exporter if it opened up trade.
Explanation:
A country has comparative advantage in production if it produces at a lower opportunity cost when compared with other countries.
If the price of the country is lower than the world price, it indicates that the country has a lower opportunity cost and a comparative advantage in the production of the good.
A country that has comparative advantage in the production of a good, should specialise in its production and export it to other countries.
A closed economy is an economy that doesn't trade with other countries.
An open economy is an economy that trades with other countries.
I hope my answer helps you
