A 32 year-old female presents with an acute narrow-complex tachycardia noted on her twelve lead EKG. Her blood pressure is 110/72. Her heart rate is 156. She denies chest pain and dyspnea. What do you order next for this patient?
A. bretylium 500 mg intravenously
B. verapamil 5 mg intravenously
C. adenosine 6 mg intravenously
D. digoxin 0.5 mg intravenously
E. lidocaine 100 mg intravenously