HELP ILL MARK BRAINLIEST!!!!!!!

What would best illustrate how the national government uses taxation to regulate international
trade?

a. Truckers are required to stop a weigh stations to pay state fines on overweight goods they are transporting
on state highways.

b. Import taxes may not be charged for goods exchanged in any trade that occurs between states.

c. City governments pass laws that makes it illegal to sell certain goods at certain times of the day or week.

d. Tariffs are used to protect American businesses from unfair foreign competition.