An older-adult patient has developed acute confusion. The patient has been on tranquilizers for the past week. The patient's vital signs are normal. What should the nurse do?

A) Take into account age-related changes in body systems that affect pharmacokinetic activity.
B) Increase the dose of tranquilizer if the cause of the confusion is an infection.
C) Note when the confusion occurs and medicate before that time.
D) Restrict phone calls to prevent further confusion.