What Is a Tension Pneumothorax

What is a tension pneumothorax?

A) A compression of the chest that prevents blood flow and sometimes causes partial lung collapse.
B) A gradual accumulation of air in the pleural space, causing a partial to total lung collapse.
C) A non-increasing amount of air in the pleural space that causes a partial lung collapse.
D) Blood that collects in the pleural space and does not cause a lung collapse.