2 days after birth, child developed respiratory distress and had scaphoid abdomen.Breath sounds were decreased on the left side.After bag and mask ventilation, ET tube was put and the maximal cardiac impulse shifted to the right side.What should be the next step in management ?

• A. Naso gastric tube insertion
• B. Chest X-ray
• C. Confirm the position of endotracheal tube
• D. Emergency surgery