The subclavian artery that arises directly from the aorta supplies the . A) right upper extremity and neck B) left upper extremity and neck C) anterior trunk wall D) posterior trunk wall

B, left upper extremity and the neck.

Explanation: The left subclavian artery is the artery that arises directly from the aorta. Its branch arises from the arch of the aorta. This artery supplies blood to the left upper extremities (the arm and shoulder) and also the neck. The right subclavian artery along side the right commom carotid artery is a branch of the brachiocephalic artery which arises from the aorta..

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