Answer:
d.)increasing the price of foreign imports.
Step-by-step explanation:
In this case the option provided helo us understand why a tariff passed by the U.S government can help american businesses, a tariff is a tax on imported goods, that has to be payed when the products enter the country, this eventually repercutes on the final price of those certain goods, making it more expensive helping the local producer to sell his product because he doesn´t have to pay tariffs, this keeps the local market competitive.