A 14-Year-Old Female Has Taken an Excessive Amount of Tylenol

A 14-year-old female has taken an excessive amount of Tylenol with codeine. Family states that they were asleep when they heard a crash and found her at the bottom of the stairs. When they asked her if she was okay, she told them that her boyfriend broke up with her and she saw no point in going on, therefore she took the overdose. As you arrive by the patient's side, you note that she is responsive to verbal stimuli and breathing shallowly. Your first action would be to:

A) open the airway with the head-tilt, chin-lift.
B) determine exactly how much medication she took.
C) start positive pressure ventilation with oxygen.
D) take manual in-line spinal stabilization.