The best response from the provided options is:
Governmental systems used laws, policies, and other systems of enforcement to control labor systems and those who participated in them. These included pro-slavery laws in the 1700s and the use of federal troops to quash strikes in the 1800s.
This response accurately reflects how governments enacted laws and utilized force to influence labor systems, particularly emphasizing the control exerted through pro-slavery legislation and military intervention during labor disputes. The other responses either repeat the same points or inaccurately state that governments loosened control, which is misleading in the context provided.