After insertion of a chest tube for a pneumothorax, a client becomes hypotensive with neck vein distention, tracheal shift, absent breath sounds, and diaphoresis. The nurse suspects a tension pneumothorax has occurred. What cause of tension pneumothorax should the nurse check for<（）
A. Infection of the lung.
B. Kinked or obstructed chest tube.
C. Excessive water in the water-seal chamber.
D. Excessive chest tube drainage.
