Which of the following is considered an intrinsic factor affecting the embalming process?

The intrinsic factors affecting the embalming process refer to those characteristics that originate from within the body itself and can influence how effectively embalming solutions work. Body mass index (BMI) is a pertinent intrinsic factor as it is a measure of body fat based on weight in relation to height. A higher BMI can indicate more body fat and, consequently, can influence the quantity and effectiveness of embalming fluids required. The composition of body tissues, which is impacted by BMI, can affect how well preservatives and disinfectants penetrate and distribute throughout the body.

In contrast, environmental conditions pertain to external factors that can influence the embalming process but do not arise from the body's characteristics. Time elapsed since death also relates to how external conditions can affect decomposition rather than being an internal characteristic. Lastly, the type of casket used is also an external factor and does not affect the biological makeup of the body itself. Therefore, body mass index stands out as the intrinsic factor that directly impacts the embalming process.