Final answer:
Factory women were persuaded to join the parade through advocacy for workers' rights and better working conditions, aligning with historical movements for labor reform and protection against unfair labor practices.
Step-by-step explanation:
The argument used to convince factory women to join the parade and advocate for their rights would typically be related to workers' rights and better working conditions. In history, movements for labor reforms have often emphasized the importance of a safe workplace, reasonable work hours, and protections against unfair labor practices. Instances such as the Triangle Shirtwaist Fire galvanized public support for labor rights and resulted in significant changes to regulations intended to protect workers. Therefore, the correct answer is c) Advocacy for workers' rights and better working conditions.