A. IV line patency: IV access is important for fluid and medication administration, but it is not the highest priority immediately postoperatively. B. Urine output: Monitoring urine output is important for assessing kidney function and fluid balance, but airway management takes precedence. C. Airway patency: The priority in the immediate postoperative period is maintaining a patent airway, as patients are at risk for respiratory complications such as obstruction, hypoxia, and aspiration due to anesthesia effects. D. Wound drainage: Assessing wound drainage is necessary to monitor for excessive bleeding or infection, but it is not the top priority compared to airway patency.