The Nurse Is Observing a Newborn for Respiratory Status

The nurse is observing a newborn for respiratory status. Which sign confirms that the respiratory status is normal?

A) Movement of diaphragm and abdominal muscles should be synchronized.
B) The chest should expand from side to side on inhalation.
C) The muscles of the chest wall should show considerable effort with breathing.
D) The baby should flare nostrils and make grunting noises when breathing.