The correct answer is: A. Quotas
A quota is a limit on the quantity of a good that can be imported into a country. Quotas are a type of non-tariff barrier, which means they are not a tax on imports. Quotas can be used to protect domestic industries from foreign competition, or to conserve resources.
Import bans are a type of trade barrier that prohibits the importation of certain goods. Import bans are usually used to protect public health or safety, or to protect domestic industries from foreign competition.
Export controls are a type of trade barrier that restricts the export of certain goods. Export controls are usually used to protect national security, or to prevent the spread of weapons of mass destruction.
Anti-dumping laws are a type of trade barrier that is designed to protect domestic industries from foreign companies that are selling goods at below cost. Anti-dumping laws usually involve imposing a tariff on the imported goods.
In conclusion, a quota is a limit on the quantity of a good that can be imported into a country. Quotas are a type of non-tariff barrier, which means they are not a tax on imports. Quotas can be used to protect domestic industries from foreign competition, or to conserve resources.