Final answer:
The most relevant information for determining the time of death is the presence of lividity, rigor mortis, and the examination of stomach contents, as these factors provide clear indicators of the body's changes post-mortem. So the correct option is C.
Step-by-step explanation:
When determining the time of death, the most relevant information would be c) the presence of lividity, rigor mortis, and/or stomach contents. Lividity refers to the discoloration of the body after death due to gravity pulling the blood to the lowest points of the body. Rigor mortis is the stiffening of muscles after death, which can provide a timeframe of death since it follows a known pattern of onset and resolution. The stomach contents can also give an estimate of the time of death by assessing the degree of digestion of the last meal.
Toxicology analysis of the urine is mainly used to check for the presence of drugs or toxins. X-rays of the corpse can be useful in determining the cause of death but are not typically used to establish the time of death. The pathological state of the heart gives information about the person's health before death and potential causes, not necessarily the timing of death.