Enhancing Argument for Library Funding

The local government of Greenfield is considering increasing funding for public libraries, citing a recent report that shows a correlation between library usage and literacy rates among children in the community. They argue that if libraries are more accessible, then literacy rates will further improve. However, some council members are skeptical, suggesting that other factors may contribute to literacy rates in the community.

To strengthen the argument for increased funding, supporters could address the potential correlation between library accessibility and literacy outcomes. Which of the following options would most effectively enhance the argument that increasing funding for public libraries will lead to improved literacy rates?