Final answer:
Tertiary injuries from a blast include being hit or impaled by objects as a result of being thrown by the blast wind. The correct answer to the question is impaled objects.
Step-by-step explanation:
Tertiary injuries from a blast are injuries that occur when an individual is thrown by the blast wind and then impacts the ground or other objects. Impaled objects is the correct answer, which refers to items that penetrate the body as a result of the blast. These injuries can occur from debris thrown by the explosion, or from the individual being thrown into nearby objects that can then penetrate the body. The other options, while certainly serious, fall into different classifications of blast injuries. For example, bowel perforations and lung injuries tend to be primary injuries (caused by the pressure wave), while extremity fractures could either be a secondary injury (caused by flying debris) or tertiary if they occur due to the force of being thrown.