Concept:An import tariff is a tax imposed on foreign goods, making them costlier than locally produced items.
Explanation:This tax raises the price of imported products in the domestic market.
As a result, imported goods become less competitive against local products.
Local producers, especially new or infant industries, can then sell their goods more easily.
Therefore, protecting young domestic industries is a major usefulness of import tariffs.
Answer:C. protection of infant industries