While administering a treatment with albuterol to a patient with COPD, the therapist notes a sudden change in the patient's color to marked cyanosis. The patient appears apneic and the heart rate on the pulse oximeter indicates 30/min. The therapist should first

a) Administer rescue breaths
b) Call a code and initiate CPR
c) Assess for a blocked airway
d) Administer epinephrine