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Comprehensive and Detailed Explanation:

The correct answer is A because new-onset atrial fibrillation with rapid ventricular response (RVR) is a frequent cardiac complication following acute stroke due to neurocardiac axis stimulation. When the patient is hemodynamically stable, the primary management objective is rate control using agents such as IV metoprolol, diltiazem, or amiodarone, alongside close telemetry and neurological monitoring. Option B is incorrect because unsynchronized defibrillation is reserved for pulseless ventricular tachycardia or ventricular fibrillation, not stable atrial fibrillation with RVR. Option C is incorrect because potassium administration requires laboratory confirmation of hypokalemia and must be infused cautiously. Option D is incorrect because neurological assessments must never be interrupted. SCRN nurses maintain vigilant cardiorespiratory monitoring to catch and treat paroxysmal arrhythmias quickly.