Hydration helps your body stay the right , not too hot or too cold. A.
weight
B.
temperature
C.
color
D.
size

B. temperature because it just is.

The answer is B, temperature.

Explanation: The body water has an important role as a thermoregulator, regulating the overall body temperature by helping dissipate heat. If the body becomes too hot, water is lost through sweat and the evaporation of this sweat from the skin surface removes heat from the body. Sweating is the most effective way that the body prevents itself from overheating.

exercising at a moderate intensity, and slowly increasing the duration.