An Emergency Medical Responder asks you to explain a pneumothorax. You would explain that a pneumothorax occurs​ when:A. the trachea becomes​ obstructed, causing the lungs to collapse.B. the lung becomes overinflated with air and collapses.C. air accumulates around the​ lung, causing a portion of it to collapse.D. air enters the lung and alveoli from a traumatic opening in the chest wall.