Final answer:
The union used c. collective bargaining to negotiate higher wages with the employer on behalf of George and his fellow workers.
Step-by-step explanation:
The strategy that the union used to get the owner to agree to increase wages was collective bargaining. Collective bargaining is a process of negotiation between employers and a group of employees aimed at agreements to regulate working salaries, working conditions, benefits, and other aspects of workers' compensation and rights. The main objective is to come to an agreement that is acceptable to both the employer and the employees. In the scenario described, the union representative acted on behalf of George and his fellow workers, creating a unified front to negotiate better wages, using their collective power to influence the employer's decision.