Final answer:
Command-and-control regulation is the environmental law that relates to this situation, requiring companies to reduce pollution and use specific pollution-control technologies. Beth's employer should replace the old and rusty faucets to prevent water wastage.
Step-by-step explanation:
The environmental law that relates to this situation is command-and-control regulation. Command-and-control regulations specify allowable quantities of pollution and may require companies to use specific pollution-control technologies. In this case, Beth's employer owns the building and is responsible for the maintenance of the faucets. If the faucets are old and rusty, they may potentially lead to water wastage. Beth's suggestion to replace the faucets aims to reduce water wastage and align with command-and-control regulation.