Answer:
C. Held their own service in secret
Here is an explanation of tariffs. Since I can't see the statements for this question, you can use the following information to help.
Tariffs are a tax on an imported goods. These tariffs cause the price of foreign goods to increase. Many businesses, especially in the North, like the idea of tariffs because it makes more likely that citizens will buy products made by them rather than buying products made in other countries. Ultimately, a tariff helps to protect American industry/businesses.
