Final answer:
A Chance fracture is a type of spinal fracture that typically occurs in a motor vehicle collision. The most likely patient to sustain a Chance fracture in a motor vehicle collision is the 19-year-old unrestrained passenger.
Step-by-step explanation:
A Chance fracture is a type of spinal fracture that typically occurs in a motor vehicle collision. It is characterized by a horizontal break across the posterior elements of the spine, usually at the level of the lower or mid-thoracic vertebrae. The most likely patient to sustain a Chance fracture in a motor vehicle collision is the 19-year-old unrestrained passenger.