A union that pursued a policy of restricting entry over time into the union would

fail to obtain benefits for their workers in excess of what the workers would get under open markets.

B.

also have to negotiate to be sure that all the members were able to find jobs.

C.

generate rising real wages for its membership over time as long as demand for union workers increased over time.

D.

see real wages hold constant over time at whatever premium they could get initially.