An 81-year-old client has been prescribed an anticholinergic drug. What action should the nurse perform to best protect the client's safety?

A) Limit the client's fluid intake to 1.5 L/day, unless contraindicated.
B) Protect the client from exposure to excessively hot temperatures.
C) Ensure the client knows to avoid high-potassium foods and salt substitutes.
D) Keep the client's bedrails fully raised at all times.