What are three factors that determine the extent of an injury?

The correct answer focuses on specific aspects that directly relate to how an injury may occur and its severity. Understanding the type of impact provides insight into the force or nature of the injury—whether it is a sharp, blunt, or crush injury can greatly influence the extent of damage. The duration of exposure is equally critical; longer exposure to a harmful environment or an unsafe situation can lead to more severe injuries or health consequences. Finally, the body part affected is essential in determining the injury's extent; different body parts have varying tolerances and healing capacities, meaning that an injury to a vital area may result in more serious implications than one affecting a less critical region.

This answer emphasizes factors intrinsic to the mechanics of injury rather than situational or external variables. In contrast, the other options touch on a mix of equipment, personal characteristics, and environmental conditions, which may influence injury risk but do not directly correlate with how injuries develop or their potential severity.