Which artery is most commonly occluded in a stroke?

A The anterior cerebral artery (ACA) may be affected in a stroke but is not the most common artery occlusion.

C: The basilar artery is a common location for strokes, but it is not the most commonly occluded artery.

D: The carotid artery can also be affected in a stroke, but it is not the most commonly occluded artery. The correct answer is the middle cerebral artery (MCA), as it supplies blood to a large portion of the brain and is a common location for blockages leading to a stroke.