Final answer:
The President may issue executive orders to reduce or modify the EPA's regulatory authority and requirements.
Step-by-step explanation:
An action that the President may take to limit the regulatory power of the Environmental Protection Agency (EPA) is issuing executive orders to reduce or modify the EPA's regulatory authority and requirements, which corresponds to option D.
By issuing executive orders, the President can change the policies and regulations that govern the EPA's activities, potentially reducing its authority and scope. This action gives the President significant power in shaping the EPA's role in environmental regulation.
For example, a President may issue executive orders that streamline or eliminate certain regulations, revise existing environmental standards, or introduce new policies that prioritize business interests over environmental protection.