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Comprehensive and Detailed Explanation:

The correct answer is A because the patient presents within the crucial 4.5-hour therapeutic window for intravenous alteplase, has a non-diagnostic head CT for hemorrhage, and maintains blood pressure well below the exclusion threshold of 185/110 mmHg. Given the focal neurological deficits suggesting a large vessel occlusion, immediate administration of intravenous thrombolysis combined with concurrent evaluation for mechanical endovascular thrombectomy represents the gold standard of hyperacute care. Option B is incorrect because a "wait and watch" approach wastes critical penumbral tissue and violates the fundamental rule that "time is brain." Option C is incorrect because aggressively lowering blood pressure below normal parameters before reperfusion can precipitate hypoperfusion and expand the ischemic core. Option D is incorrect because waiting for advanced perfusion imaging when non-contrast CT is already negative and the patient is within the window creates dangerous treatment delays. SCRN nurses facilitate rapid-response workflows to optimize door-to-needle metrics and maximize functional recovery.