A client with a pneumothorax receives a ch

问题：

A client with a pneumothorax receives a chest tube attached to a Pleur-evac. The nurse notices that the fluid of the second chamber of the Pleur-evac isn't bubbling. Which nursing assumption would be most invalid

A．The tubing from the client to the chamber is blocked.

B．There is a leak somewhere in the tubing system.

C．The client's affected lung has reexpanded.

D．The tubing needs to be cleared of fluid.