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Comprehensive and Detailed Explanation:

The correct answer is B because the anterior cerebral artery (ACA) supplies the medial aspect of the cerebral cortex, including the motor and sensory areas corresponding to the lower extremities, as well as the frontal lobe structures governing executive function, volition, and behavioral inhibition. Consequently, occlusion of the ACA classically produces contralateral lower extremity weakness and sensory loss greater than the face and arm, alongside apathy (abulia), personality changes, and urinary incontinence due to involvement of the medial frontal micturition center. Option A is incorrect because middle cerebral artery strokes cause greater upper extremity and facial weakness, accompanied by aphasia or neglect. Option C is incorrect because posterior cerebral artery strokes cause visual field deficits, memory impairment, and thalamic syndromes. Option D is incorrect because vertebrobasilar strokes produce cranial nerve findings, ataxia, and brainstem signs. Knowledge of vascular topography is critical for accurate neurological localization by SCRN-certified nurses.