A 16-year-old patient with a history of asthma presents with a respiratory rate of 28 breaths per minute, heart rate of 110 beats per minute, and fatigue. The patient appears anxious, diaphoretic, and cyanotic. She is retracting her sternocleidomastoid muscles in an effort to breathe. Which of the following is the least appropriate management step? A. Initiate O2 therapy, consider the eventuality of intubation and escalate setting B. Give injection of epinephrine C. Nebulize inhaled short-acting beta agonist D. Parenteral corticosteroids