A monitored patient in the ICU developed a sudden onset of narrow-complex tach at 220/min. The patient's BP is 128/58 mmHg, PETCO2 38 mmHg, and pulse oximetry 98%. Vascular access in the left arm, and the patient has not been given any vasoactive drugs. 12 lead ECG confirms supraventricular tachy with no evidence of ischemia or infarction. HR has not responded to vagal maneuvers. What is your next action?

a) Administer adenosine
b) Administer amiodarone
c) Administer beta-blockers
d) Administer calcium channel blockers