Answer:
Sediment Rocks?
Explanation:
Coal, oil, and natural gas are examples of fossil fuels.  Coal is a material usually found in sedimentary rock deposits where rock and dead plant and animal matter are piled up in layers. 
If there's a A, B, C, D answer tell me if its not on there! Thanks!
 
        
             
        
        
        
The correct answer for the question that is being presented above is this one: "oxygen became available from cyanobacteria." About 1.2 billion years ago, eukaryotic and multicelled organisms evolved because oxygen became available from cyanobacteria.
        
             
        
        
        
B. Napoleon invaded Spain and Portugal - situation in Europe particularly in Spain provided an opportunity for Spain's overseas territories to fight for their independence. Napoleon's army occupied Spain and Portugal where he wanted to change a king which resulted into civil war.