Which Measure Would Be Most Appropriate for the Nurse to Do

Which measure would be most appropriate for the nurse to do to ensure that a child's endotracheal (ET) tube is correctly positioned?

A) Auscultate for abdominal breath sounds
B) Mark the tracheal tube at the child's lip
C) Watch for a yellow display on a CO₂ monitor
D) Inspect for water vapor in the tracheal tube