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Comprehensive and Detailed Explanation:

The correct answer is A because the middle cerebral artery (MCA) is the largest branch of the internal carotid artery and supplies the lateral surface of the cerebral hemispheres, including the motor and sensory cortex representations for the face and upper extremities, as well as dominant language centers (Broca's and Wernicke's areas). Consequently, MCA occlusion characteristically produces contralateral face and arm weakness and sensory loss that are disproportionately more severe than leg involvement, often accompanied by aphasia when the dominant hemisphere is affected. Option B is incorrect because anterior cerebral artery strokes cause greater lower extremity weakness and apathy. Option C is incorrect because posterior cerebral artery strokes cause visual field cuts and memory deficits. Option D is incorrect because vertebral artery strokes cause brainstem signs. Recognizing vascular topographies is essential for advanced neurological assessment by SCRN nurses.