A nurse is reinforcing teaching with the guardians of a preschooler who has leukemia. The nurse should identify that which of the following educational topics is the priority to include?

A. Managing mucosal ulcerations: Mucosal ulcerations are a common side effect of chemotherapy and can cause discomfort, but they are not immediately life-threatening. They should be addressed, but they are not the primary concern. B. Promoting nutrition: Nutrition is important for healing and energy during leukemia treatment. However, nutritional challenges can be managed over time and do not typically pose an acute risk if slightly compromised. C. Preventing infections: Immunosuppression caused by leukemia and its treatment places children at high risk for life-threatening infections. Infection prevention is the top priority and includes hand hygiene, limiting exposure, and monitoring for fever. D. Supporting psychological wellness: Psychological support is crucial in the overall care plan, but it is not the most immediate concern compared to the risk of infection, which can quickly escalate in immunocompromised patients.