Final answer:
The evaporation of sweat is influenced by environmental factors such as temperature, wind speed, and vapor pressure, all of which contribute to the body's ability to cool down through sweat evaporation.
Step-by-step explanation:
The evaporation of sweat is dependent upon several environmental factors: temperature, wind speed, and vapor pressure. The rate at which sweat evaporates from the skin, which is essential for body cooling, is influenced by the temperature because higher temperatures provide more energy for the evaporation process. Moreover, the wind speed can affect evaporation by moving the air surrounding the skin, leading to a greater evaporation rate because it removes the humid air layer that can act as a barrier to evaporation. Lastly, vapor pressure plays a role, as a lower vapor pressure in the surrounding air relative to the sweat leads to higher evaporation rates. Essentially, lower humidity (which correlates with vapor pressure) enhances the ability of sweat to evaporate. Therefore, the correct answer to the student's question is d. All of these factors are correct.