(WILL MARK BRAINLIST) which has been the primary source of energy in the most recent century wood and coal
wood and nuclear
petroleum, natural gas, and coral
hydroelectric and other renewables

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation:

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully