The correct answer is D. Latent heat transfer.
Perspiration is the primary way that the body cools itself. When sweat evaporates, it takes heat energy with it, which cools the body. This is an example of latent heat transfer, which is the heat that is absorbed or released during a change of state. In the case of perspiration, the liquid water changes into a gas (water vapor) and takes heat energy with it.
Advective heat transfer is the transfer of heat by the movement of a fluid. In the case of perspiration, this would be the movement of air over the skin, which would carry away the heat from the sweat.
Radiative heat transfer is the transfer of heat by electromagnetic radiation. In the case of perspiration, this would be the heat that is radiated from the skin to the surrounding environment.
Conductive heat transfer is the transfer of heat by direct contact. In the case of perspiration, this would be the heat that is transferred from the skin to the clothing that is in contact with it.
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