You are presented with the question "What powers sweat?" and the following answer choices: 
- heat produced
 - The body's fuel
 - a gas in the air
 - hydration
 - When the water is hot
 - air cools
 - matter vibrating
 - Cooling vapors

Now knowing that evaporation of sweat uses energy, and the energy comes from body heat and energy is the body's fuel, choose the best answer.


 

  The body's fuel       