Having recently found sources of oil on their own land, a newly established nation enacted a tariff on imported petroleum in order to raise money for their new government. This trade restriction is an example of a tariff.

Since sugar comes from food, digestive system would directly affect blood sugar levels. The food that we eat will go to the digestive system. It is there where the food breakdown to nutrients, fats, or waste. Therefore, the correct answer is digestive system.