What should be done with banned or leftover pesticides?

The correct response emphasizes the importance of proper disposal methods for banned or leftover pesticides. These substances can be hazardous to both the environment and public health if not handled correctly. Returning them to dealers or participating in clean sweep programs ensures that they are disposed of in a safe manner, adhering to regulations designed to protect human health and the ecosystem. Clean sweep programs are specifically set up to allow the safe collection and disposal of hazardous materials, providing a structured way to handle these products responsibly. This option reinforces the commitment to environmental stewardship and regulatory compliance, which is critical for pesticide management.