A tariff is a tax imposed on goods imported into a country. This means that when products are brought in from abroad, the government charges a fee, known as a tariff, which can affect the price of those goods for consumers.
Tariffs are often used as a way to protect domestic industries by making imported goods more expensive, thus encouraging consumers to buy products made within their own country. They can also serve as a source of revenue for the government.
In summary, the correct answer to the question is a) an imported good.