Which statement indicates effective teaching about lead poisoning prevention?

The statement that indicates effective teaching about lead poisoning prevention is that wet mopping floors and washing windowsills weekly is a proactive approach to reducing lead exposure. This method is particularly important in homes that may have lead-based paint, as lead dust can accumulate on surfaces and be inhaled or ingested by children. Wet mopping is more effective at capturing dust and particles than dry methods, thereby minimizing the risk of lead exposure.

In contrast, scraping paint off walls might inadvertently create lead dust if the paint contains lead, unless done with proper safety precautions. Allowing children to eat whenever they are hungry does not directly address lead exposure risks, as it does not focus on maintaining a clean, safe environment. Lastly, leaving a patch of dirt uncovered can increase the risk of lead poisoning if that dirt is contaminated, highlighting the importance of managing potential lead sources in the home environment.