Which of the following is NOT a part of RCRA's focus?

The Resource Conservation and Recovery Act (RCRA) primarily focuses on the management of hazardous and non-hazardous waste, including its generation, transportation, treatment, storage, and disposal. Key components of RCRA include hazardous waste storage, use of hazardous materials, and waste minimization efforts, which are all aimed at protecting human health and the environment from potential risks associated with waste management.

Disposal of agricultural byproducts, however, does not fall under the RCRA's primary focus. While agricultural waste can sometimes be hazardous, the regulations and guidelines for managing agricultural byproducts are typically addressed through other frameworks and legislation that are more specifically tailored to agricultural practices, such as the Clean Water Act or specific agricultural waste management standards. Thus, this option does not align with RCRA, which is more concerned with the broader categories of hazardous and non-hazardous waste management.