Unions Attempt to Increase the Demand for Their Output by All

Unions attempt to increase the demand for their output by all of the following strategies except

A) advertise in order to persuade the public to only buy union-made goods
B) pressure Congress to impose restrictive tariffs and quotas on foreign imports
C) lobby the government for increased spending for schools, national defense, and the like
D) restrict the supply of labor by limiting union membership and requiring long apprenticeships