A nurse is assisting in planning care for a client who has cystitis. Which of the following interventions should be included in the plan of care?

A. Inform the client that taking Vitamin E supplements will decrease the incidence of cystitis: Vitamin E supplementation do not prevent or treat cystitis. UTIs are primarily related to bacterial colonization and urinary tract irritation, not antioxidant deficiency, this intervention does not address the underlying cause. B. Instruct the client to take antibiotics until dysuria is no longer present: Antibiotics must be taken for the full prescribed course, even if symptoms improve early. Stopping treatment when dysuria resolves can lead to incomplete eradication of bacteria, recurrence of infection, and antibiotic resistance. C. Direct the client to wash under clothing in bleach: Washing underwear in bleach is unnecessary and can cause skin irritation or allergic reactions. Routine laundering with mild detergent is sufficient and safer for preventing irritation of the urinary and perineal area. D. Instruct the client to avoid caffeinated beverages: Caffeine acts as a bladder irritant and can worsen urinary urgency, frequency, and discomfort associated with cystitis. Avoiding caffeinated drinks helps reduce bladder irritation and supports symptom relief during infection.