A postoperative client returns to the nursing unit following a ureterolithotomy via a flank incision. Which potential problem has the highest priority when planning nursing care for this client?

A. Ineffective airway clearance: A flank incision can cause significant pain with movement and breathing, leading to shallow respirations, decreased coughing, and increased risk of atelectasis or pneumonia, making airway management the highest priority. B. Activity intolerance: While limited activity is expected after major surgery, it is not immediately life-threatening and can be addressed after ensuring respiratory stability. C. Fluid volume excess: Fluid balance must be monitored postoperatively, but unless there are signs of renal impairment or heart failure, it is a lower priority compared to airway management. D. Altered nutrition; less than body requirements: Nutrition is important for healing but does not take precedence over preventing respiratory complications immediately after surgery.