A 18 years old Male, injured by traffic accident, coming to the hospital for emergency treatment, unconscious, mud and sand mixed with blood in the mouth and nose, dyspnea, serious swelling on the left chest, heart rate 98 times / min, blood pressure 120 / 90mmHg, automatic movement of limbs, serious swelling and deformity on the left knee. At this time, the most urgent rescue measure is:
A.
ask the thoracic surgeon for consultation and treatment
B.
remove the mud and blood in the mouth and nose and keep the respiratory tract unobstructed
D.
provide oxygen to the patient
E.
splint fixation of the left lower extremity