Final answer:
In an unstable patient with monophasic V-tach with pulse, 1) synchronized cardioversion is the treatment of choice.
Step-by-step explanation:
In an unstable patient with monophasic V-tach with a pulse, the treatment of choice would be synchronized cardioversion, which is the delivery of a controlled electric shock to the heart to restore a normal rhythm. This is different from electrical defibrillation, which is used in patients without a pulse. Antiarrhythmic medications may be used to prevent recurrence of the arrhythmia, but in an unstable patient, synchronized cardioversion is the first-line treatment.