You are dispatched to a residence for an elderly female who has possibly suffered a stroke. you find her lying supine in her bed. she is semiconscious; has vomited; and has slow, irregular breathing. you should: a: perform a head tilt-chin lift and insert an oral airway. b: administer high-flow oxygen and place her on her side. c: manually open her airway and suction her oropharynx. d: insert a nasal airway and begin assisting her breathing.