Which of the following is considered a life-threatening injury?

A head injury is considered a life-threatening injury because it can lead to serious complications, including bleeding, swelling, and pressure on the brain, which can impair normal brain function. Head injuries can result from various causes such as falls, accidents, or violent impacts. The brain is a vital organ, and any injury in this area could lead to cognitive issues, unconsciousness, or even death if not treated promptly.

In contrast, a concussion, while serious and requiring medical attention, is typically classified under mild traumatic brain injuries and may not always be immediately life-threatening. A broken finger, although painful and potentially requiring medical treatment, does not usually pose an immediate threat to life. Similarly, a minor cut generally signifies a superficial injury that is unlikely to cause serious harm if properly managed. Thus, it's clear why a head injury is prioritized in terms of potential danger to life.