The jugular notch on the sternum is __________.

• A. opposite the ninth thoracic vertebra
• B. a cartilaginous joint that acts as a hinge during respiration
• C. a handy point for finding the second rib; this is useful when counting the ribs during clinical procedures
• D. in line with the second and third thoracic vertebra, where the left common carotid artery is issued from the aorta