Answer the following question given this paragraph: 

A: A hot water heater increases the temperature of water in most homes. Many hot water heaters burn a fuel such as natural gas. The burning fuel causes the water to get hot because combustion is an exothermic reaction.


Q: In a hot water heater, burning fuel causes the water to get hot because combustion is what type of reaction?

 Choices:

- endothermic

- geothermal

- biochemical

- exothermic

A:
exothermic
