A 49-year-old male has summoned EMS because of a problem with his tracheostomy tube. At the patient's side, you note the tracheostomy tube to be protruding abnormally from the stoma in his neck. Your first action in caring for this patient would be to:

A) gently attempt to reinsert the tracheostomy tube.
B) quickly establish a baseline SpO2 level.
C) establish how the tracheostomy tube became dislodged.
D) evaluate the patient's airway and breathing.

D