Answer:
C) Labor unions
Step-by-step explanation:
Issues such as child labor were brought to America's attention primarily by labor unions. Labor unions advocated for workers' rights and better working conditions, including the abolition of child labor. They played a significant role in raising awareness about the exploitation of children in the workplace and pushing for legislative reforms to protect young workers. While other groups, such as suffragettes, abolitionists, and civil rights activists, also addressed social and political issues, it was labor unions that specifically focused on labor-related concerns like child labor.