Factory workers used which of the following to negotiate for better wages (or not being paid in scrip), hours, and working conditions?

A. Trusts Collective

B. Bargaining

C. Mass Production

D. Legislation

I believe the correct and complete answer is Collective bargaining, since it is a process of negotiation in which a group of employees were able to get better conditions in factories from their employers with agreements between workers and owners, to regulate working salaries, working conditions, benefits, and other aspects of workers' compensation and rights for workers.