Answer: Increase American production of steel (B)
Step-by-step explanation:
A quota is a numerical limit on the amount of units of a product that can be imported. A quota is a form of protection or trade restrictions used by a country.
Like every other forms of trade protection such as tariffs, embargo etc, the quota is used by a country to help it's infant and local industries to grow, provide employment opportunities for it's people and also lead to economic growth.
If a quota is placed on imported steel, there'll be a reduction in the number of steel imported into the country and this will lead to a rise in the number of steels produced by American firms.