Which of the following is a source of lead exposure?

Old paint is a significant source of lead exposure, especially in homes built before 1978 when the U.S. banned the use of lead-based paints in residential properties. When old paint deteriorates, it can create lead dust or chips that young children may ingest, either by putting their hands or objects that have come into contact with the dust into their mouths.

Lead exposure is particularly dangerous for young children as it can affect their development and lead to serious health problems. While the other choices may have health risks, they do not have the same direct and well-established connection to lead exposure as old paint does. For instance, fresh fruits, school supplies, and cooking oils are not typically associated with lead contamination.