What was one of the successful actions taken by the International Labour Organization?

The successful action taken by the International Labour Organization (ILO) in limiting the number of working hours for children is significant as it directly addresses child labor, which has historically been a major issue in many countries. The ILO was established in 1919 to promote social justice and fair labor practices, and one of its early concerns was the protection of children in the workforce.

Limiting working hours was a critical step in ensuring that children could have a more balanced life that allowed for education and personal development rather than solely labor. By advocating for restrictions on child labor, the ILO contributed to broader movements for children's rights and welfare, which have influenced labor laws and policies worldwide.

This effort aligns with the ILO's mission to create fair and humane working conditions, emphasizing the protection of vulnerable populations, such as children, to promote better labor standards overall. Other options reflect important issues but do not specifically address one of the ILO's foundational and direct accomplishments related to child labor regulation.