To Verify the Correct Placement of an Oral Endotracheal Tube

To verify the correct placement of an oral endotracheal tube (ET) after insertion,the best initial action by the nurse is to

A) auscultate for the presence of bilateral breath sounds.
B) obtain a portable chest x-ray to check tube placement.
C) observe the chest for symmetric chest movement with ventilation.
D) use an end-tidal CO₂ monitor to check for placement in the trachea.