Which of the Following Is True About Import Controls

Which of the following is true about import controls?

A) Nontariff barriers like voluntary restraint agreements are self-imposed restrictions and cutbacks aimed at avoiding punitive trade actions from the host.
B) Import controls generally exact a small price from domestic consumers.
C) The social cost of import controls benefits the economy in all situations.
D) Import controls improve the productivity of an industry, provide it with a level of safety and a cushion of increased income, and lead the drive for technological advancement.