<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 63-year-old man is brought to the emergency department, 30 minutes after being involved in a high-speed motor vehicle collision. He is obtunded on arrival. He is intubated and mechanical ventilation is begun. The ventilator is set at a FiO2 of 60, tidal volume of 440 mL, and positive end-expiratory pressure of 4 cm H2O. On the third day of intubation, his temperature is 37.3C 99.1F, pulse is 91min, and blood pressure is 10360 mm Hg. There are decreased breath sounds over the left lung base. Cardiac examination shows no abnormalities. The abdomen is soft and not distended. Arterial blood gas analysis shows:pH 7.49pCO2 29 mm HgpO2 73 mm HgHCO3- 20 mEqLO2 saturation 89Monitoring shows a sudden increase in the plateau airway pressure. An x-ray of the chest shows deepening of the costophrenic angle on the left side. Which of the following is the most appropriate next step in management?? A: Administer levofloxacin, B: Increase the PEEP, C: Insertion of a chest tube, D: CT scan of the chest, E: Close observationn,  <response>: This is a clinical vignette about a 63-year-old man who was involved in a high-speed motor vehicle collision and is now intubated in the ICU. The key findings are decreased breath sounds over the left lung base, deepening of the left costophrenic angle on chest X-ray, and a sudden increase in plateau airway pressures, suggesting a pneumothorax. The most appropriate next step would be to insert a chest tube to relieve the pneumothorax and improve oxygenation. C: Insertion of a chest tube 