Which of the following is a potential hazard of using lead it in paints?

Using lead in paints poses significant health risks associated with lead exposure, which is why this choice is the correct answer. Lead is a toxic substance that can lead to serious health issues, particularly in young children and pregnant women. It can affect the nervous system, brain development, and overall health, leading to developmental delays and cognitive impairments. Chronic exposure can result in more severe health problems, including lead poisoning, which is a critical concern in both residential and occupational settings.

The other options, while they may seem relevant, do not address the core issue of health hazards. Increased glossiness, natural fading with sunlight, and higher viscosity for spreads refer to physical or aesthetic properties of paint rather than the health implications associated with its chemical composition. Thus, they do not capture the most pressing concern regarding the use of lead in paints, which is the risk to human health.