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Time of death is determined by the rigor mortis method, which is the most effective forensic method hence option a is correct.What is an effective method to determine the time of death? This stiffening process, known as Rigor Mortis, has a generally known recurrence period and may thus be used to determine the time of death. In general, if the corpse is warm and there is no rigidity, death happened within the last 3 hours. The death happened 3-8 hours earlier if the corpse is warm and rigid. If the body is discovered before the body temperature has reached equilibrium with the ambient temperature, forensic experts can determine the time of death by measuring the body's core temperature.Therefore rigor mortis is the best effective method to determine the time of death, hence option a is correct.Learn more about the time of death, here:https://brainly.com/question/13554527#SPJ1