What defines death according to the legal standards?

The correct option reflects the legal definition of death, which is established as the irreversible cessation of all brain function, including the brain stem. This definition is significant because it provides a clear, medically sound standard by which to determine death, distinguishing it from other states that may mimic death, such as certain types of organ failure or coma.

Complete organ failure could imply that certain organs are no longer functioning, but it does not necessarily equate to death if brain activity is still present. Similarly, loss of bodily warmth and inability to breathe are not definitive indicators of death, as these conditions can occur in individuals who are still alive under specific medical interventions. Thus, the irreversible cessation of brain functions encompasses a more comprehensive understanding of death that aligns with legal and medical guidelines.