Fact 1: Astove is used for cooking by generating heat.

Fact 2: Gas is the source of energy for heating water and for the stove.

Given the two facts above, answer the question "What does a stove use to cook?" with the following options: 
- fire
 - wood
 - Water
 - oil
 - food
 - Nitrogen
 - Gas
 - h20


 

       Gas  