Which of the Following Statements Is True of Tariffs

Multiple Choice

Which of the following statements is true of tariffs?

A) Tariffs increase an imported product's appeal to buyers.
B) Transit tariffs are the most widely-levied tariffs.
C) Ad valorem tariffs are levied as a specific fee for each unit of an imported product.
D) Export tariffs are used by countries when they believe an export's price is lower than it should be.