What potential health issue can lead in drinking water cause?

Lead in drinking water can significantly impair mental functioning in children. This is particularly concerning because lead exposure, even at low levels, can adversely affect a child's developing brain. It can lead to cognitive deficits, lower IQ scores, attention problems, and various learning disabilities. The vulnerability of children to lead exposure is heightened due to their developing neurological systems, making it crucial to address lead contamination in water supplies to protect their health and well-being.

While the other options may reference health issues associated with lead or other contaminants, the specific connection between lead exposure and impaired mental functioning in children is well-documented in medical literature. Reducing lead levels in drinking water is essential for safeguarding children's health and promoting healthy neurological development.