Evaluating Necessary Information in Educational Outcomes

Many studies indicate that families with higher incomes tend to invest more in their children's education, leading to better educational outcomes for those children. Despite this correlation, it has been argued that income is not the sole factor affecting educational success. Other elements, such as parental involvement and access to resources within the community, also play crucial roles. Therefore, to improve educational outcomes across all socioeconomic statuses, programs must not only enhance parental income but also focus on strengthening community support systems.

Given this argument, which of the following pieces of information, if true, would most seriously weaken the argument?