Which of the following is NOT a method the body uses to maintain thermoregulation?

The body maintains thermoregulation through various methods, and perspiration is indeed one of the primary mechanisms involved. When the body temperature rises, sweat is produced on the skin's surface. As this sweat evaporates, it cools the skin and helps reduce overall body temperature, thus playing a crucial role in thermoregulation.

In the context of the options provided, while perspiration appears twice, its correct role as a cooling mechanism makes "C" the option that aligns with what's considered standard. Each choice related to perspiration effectively references the same physiological process.

Contrastingly, other methods such as insulation involve body fat or clothing creating a barrier that helps retain heat, which is essential in cold conditions. Evaporation, as discussed, is tied closely to the sweating process, and although there may be confusion due to the repeated mention of perspiration, it's important to note that it's not categorized differently when it appears again in the list. Hence, the selection illustrates the understanding of redundancy in thermoregulatory methods rather than introducing a distinctive, separate method.