Unions Tend to Want Import Restrictions Because

Unions tend to want import restrictions because

A) imports are usually of inferior quality.
B) they can increase the wages for union workers by increasing the productivity of union workers when the workers aren't worried about foreign competition.
C) the restrictions also reduce the number of immigrants that can enter the country and decrease the supply of nonunion labor.
D) the restrictions decrease the demand for non-union made goods, increasing the demand for union made goods.