Examine the Following Figure

The nurse is caring for a client with suspected upper GI bleeding.The nurse inserts a nasogastric (NG)tube for gastric lavage and checks placement of the tube in the stomach.When fluid is aspirated from the tube,the pH is found to be 6.Which is the priority action of the nurse? A) Obtain an order for a stat chest x-ray. B) Auscultate over the lung fields bilaterally. C) Assess whether the tube is coiled in the client's throat. D) Auscultate over the epigastric area while instilling air.