Answer:
C. collective bargaining
Explanation:
Collective bargaining is when negotiations for better terms of service involve and a group of employees or organized representatives of employees and the employers. The essence of collective bargaining is to have negotiations conducted by parties with interests only, not outsiders.
Collective bargaining may involve a single firm and its employees or employees from different organizations within the industry and their employers. The negotiation objective is to reach an agreement on improved terms or better working conditions.