A 24-year-old female complains of chest pain and difficulty breathing. She tells you a horse kicked her in the chest. Her skin is pale and diaphoretic. You observe a contusion to the left side of her anterior chest wall. Breath sounds are absent over her left lower lung. Her vital signs are P 116, R 22, BP 92/80, and SpO2 is 95% on room air. You should suspect:
a) Cardiac contusion
b) Tension pneumothorax
c) Flail chest
d) Pulmonary embolism