You are presented with the question "what can produce electricity?" and the following answer choices: 
- rivers
 - animal transport
 - tidal caves
 - Nematoda
 - rays or beams
 - animals
 - cactuses
 - photons

Now knowing that tidal energy can be used to produce electricity and tidal caves are formed by the energy of the rising and falling tides, choose the best answer.


 

   tidal caves      