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Comprehensive and Detailed Explanation:

The correct answer is A because the anterior cerebral artery (ACA) supplies the medial surface of the frontal and parietal lobes. The motor and sensory cortex representations for the lower extremity are located along this medial strip. Consequently, ACA occlusion characteristically produces contralateral leg weakness and sensory loss that are disproportionately more severe than arm involvement. Additionally, ACA strokes affect the frontal lobe structures governing motivation, executive function, and the micturition inhibition center, resulting in abulia (apathy) and urinary incontinence. Option B is incorrect because middle cerebral artery strokes cause greater facial and upper extremity weakness, often accompanied by aphasia or neglect. Option C is incorrect because posterior cerebral artery strokes cause visual field cuts and memory deficits. Option D is incorrect because basilar artery strokes cause brainstem signs and cranial nerve palsies. Recognizing vascular topographies is essential for advanced neurological assessment by SCRN nurses.