A40-year-old female, unrestrained, impacted the steering wheel of her vehicle with her chest when her vehicle hit a tree while traveling at 45 mph. she is conscious and alert, but is experiencing significant chest pain and shortness of breath. given the mechanism of injury and her present condition, it is least likely that she experienced:
a. a cardiac contusion.
b. a pulmonary contusion.
c. multiple rib fractures.
d. a head injury.