You are presented with the question "what can be used to produce electricity?" and the following answer choices: 
- ocean thermal
 - a hydraulic system
 - a delta
 - Firecrackers
 - by indirect light
 - engines
 - hydrogen and oxygen
 - rays or beams

Now knowing that tidal energy can be used to produce electricity and ocean thermal is energy derived from waves and also from tidal waves, choose the best answer.


 

 ocean thermal        