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Comprehensive and Detailed Explanation:

The correct answer is B because for selected patients with high-grade (70% to 99%) asymptomatic carotid stenosis, carotid endarterectomy (CEA) or carotid artery stenting (CAS)—when performed by an experienced operator with low perioperative complication rates—is indicated to reduce long-term stroke risk, provided the patient has a reasonable life expectancy. This is combined with aggressive medical management (antiplatelet therapy, statins, and blood pressure control). Option A is incorrect because emergent intervention within 24 hours is reserved for symptomatic carotid stenosis, whereas asymptomatic lesions allow for planned, elective evaluation. Option C is incorrect because watchful waiting alone for a 75% stenosis misses an opportunity for stroke prevention in suitable candidates. Option D is incorrect because radical neck dissection is an oncological procedure, not a vascular strokeprevention intervention. SCRN nurses educate patients on procedural risks and benefits while coordinating multidisciplinary surgical evaluations.