Following a motor vehicle collision, a client with chest trauma receives a chest tube to relieve a hemothorax. Two hours after chest tube insertion, the nurse observes the water level in the water-seal chamber rising during inspiration and falling during expiration. Which action should the nurse implement?

Choice A reason: While auscultating lung sounds is part of routine assessment, the described water-seal chamber behavior—tidaling with respiration—is expected and normal. No immediate concern is indicated. Choice B reason: Tidaling in the water-seal chamber reflects normal pressure changes during breathing and confirms tube patency. The appropriate action is to continue monitoring without intervention. Choice C reason: Lifting the chest tube to clear drainage could disrupt the system and increase the risk of backflow or contamination. It is not indicated unless there is a blockage. Choice D reason: Inspecting the insertion site is important but not the first action when normal tidaling is observed. There is no indication of leakage or malfunction in this scenario.