What does the Toxic Substances Control Act (TSCA) of 1976 primarily regulate?

The Toxic Substances Control Act (TSCA) of 1976 primarily regulates the production and use of chemical substances, making option B the correct answer. TSCA was established to address the manufacture, import, processing, distribution, use, and disposal of chemical substances in the United States. Its main objective is to ensure that chemicals do not pose an unreasonable risk to human health or the environment.

Under TSCA, the Environmental Protection Agency (EPA) has the authority to require reporting, record-keeping, and testing requirements for chemical substances. This includes the ability to restrict or ban the use of particular chemicals that may be hazardous. The act provides a framework for the safe management of existing chemicals as well as new ones introduced to the market.

The other options relate to different aspects of environmental health and safety. While hazardous waste control and regulation at healthcare facilities are important components of environmental protection and public health, these fall under different laws, such as the Resource Conservation and Recovery Act (RCRA) for hazardous waste management. Transport documentation of toxic substances, while relevant to safety, is also not the primary focus of TSCA. Thus, recognizing that TSCA specifically aims at the regulation of chemical substances reinforces the correctness of option B.