A nurse is reinforcing teaching with a client who is undergoing radiation therapy to the neck. Which of the following instructions should the nurse include in the teaching?

A. Eat three large meals each day: Radiation to the neck commonly causes mucositis, dysphagia, and anorexia, making large meals difficult to tolerate. Small, frequent, high-calorie meals are better suited to maintain nutrition and reduce fatigue during eating. Meal size should accommodate swallowing comfort and energy levels. B. Limit fluid intake to 750 mL per day: Adequate hydration is essential during radiation therapy to support tissue healing and prevent dehydration. Fluid restriction is not indicated unless there is a separate medical condition requiring it. Reduced intake may worsen mucosal dryness and discomfort. C. Cleanse the neck by rubbing with a washcloth: Irradiated skin is fragile and prone to breakdown due to impaired cellular regeneration. Rubbing or friction can cause skin irritation, desquamation, and delayed healing. Gentle cleansing with mild soap and patting dry is recommended. D. Avoid exposing the neck to the cold: Radiation-treated skin is highly sensitive to temperature extremes due to altered vascular response and reduced protective barriers. Cold exposure can increase discomfort, impair circulation, and exacerbate skin injury. Protecting the area helps preserve skin integrity during therapy.