Final answer:
The right common carotid artery arises from the brachiocephalic artery, and the left common carotid arises from the aortic arch. Arrow B points to the right common carotid artery.
Step-by-step explanation:
The common carotid artery divides into internal and external carotid arteries. The right common carotid artery arises from the brachiocephalic artery and the left common carotid artery arises directly from the aortic arch.
The common carotid artery supplies the respective sides of the head and neck with fresh, oxygenated blood. To determine which arrow points to the right common carotid artery, you need to identify the arrow that originates from the brachiocephalic artery, as this is the correct one. Based on the options provided, arrow B points to the right common carotid artery.