Final answer:
The correct average skin temperature change is not determinable from the given data. More specific details are needed, such as initial and final skin temperatures, to calculate the average change.
Step-by-step explanation:
The question seems to be asking about the average temperature change of the skin in a certain context, possibly related to heat transfer and thermal regulation in the human body. Although the question does not provide explicit data to calculate the average skin temperature change, there are clues within the supplied information that suggest an application of the principles of physics, specifically thermodynamics.
It is crucial to apply the concept of thermal equilibrium and energy conservation to estimate how the human body temperature adjusts in various environmental conditions. For instance, during strenuous exercise or when exposed to a sauna, as mentioned in the information provided, the body might experience a rise in skin temperature due to increased metabolic rates or ambient temperatures.
The detailed answer would require more specific data from the provided excerpts, such as initial and final skin temperatures, to calculate the average temperature change. Since the answer is not directly available in the information given, we are not in a position to select the correct answer option from (a) 18 degrees F, (b) .95 degrees F, (c) 20 degrees F, (d) 1.3 degrees F. We recommend reviewing the full context of the data or experiment to determine the average skin temperature change accurately.