Answer the following question given this paragraph: 

Hydrocarbons are extremely important to modern life. Their most important use is as fuels. Hydrocarbons are also used to manufacture many products including plastics. The main source of hydrocarbons is fossil fuels.


Q: What is the main source of hydrocarbons?

 Choices:

- photosynthesis

- greenhouse gases

- decomposers

- fossil fuels

A:
fossil fuels
