A 37-year-old house painter fell from a ladder and fractured his left third rib and the structures with which it articulated. Which of the following structures would most likely be damaged?

a. Manubrium of the sternum
b. Body of the second thoracic vertebra
c. Spinous process of the third thoracic vertebra
d. Body of the fourth thoracic vertebra
e. Transverse process of the second thoracic vertebra