Answer: Option C
:
C
Fossil fuels come from the very old life forms that have decomposed over a long period of time under the earth's crust. Fossil fuelis a general term for the buried combustible deposits,formedfrom the decomposition of organic matter (such as plants and animals) when subjected to high heat and pressure in the earth's crust overhundreds of millions of years.The three most important fossil fuels arecoal,petroleum or crude oil, andnatural gas.