Answer: C: limit
A tariff is a form of taxation on foreign products, while a quota is a limit on imports from foreign countries.
Explanation:
A tariff refers a tax levied or imposed on goods and services imported or purchased from other countries in order to increase the price. This is done in order to make import less desirable and competitive. It is used as a means of restricting trade from other countries.
A quota refers to trade restriction imposed by the government on imported goods and services.