Final answer:
In embalming, the cause of death is a key factor in determining the strength of the embalming solution due to its potential effects on the body's condition and the need for certain levels of disinfection and preservation.
Step-by-step explanation:
The factor that is considered in determining embalming solution strength is cause of death. This is an important factor because certain causes of death can affect the condition of the body, which in turn influences the type and strength of the embalming solution needed. For example, if the decedent had an infectious disease, a stronger solution may be required to ensure proper disinfection and preservation. Other considerations might include the postmortem interval, which is the amount of time that has passed since the individual died, and ambient temperature, as both can influence the rate of decomposition. However, the decedent's age is not typically a factor that would significantly alter the strength of the embalming solution used.