Many Countries Engage in Trade Protection by Imposing Import Tariffs

Many countries engage in trade protection by imposing import tariffs or quotas for at least some goods.This is because:

A) economists have established that such restrictions are welfare-improving for certain categories of goods (such as raw materials) .
B) such restrictions tend to benefit consumers without harming producers.
C) while such restrictions harm consumers,they benefit producers,who are usually a more cohesive and politically influential group.
D) while such restrictions harm consumers and benefit producers,the losses to consumers are outweighed by the gains to producers.