You are presented with the question "What do microbial fuel cells transform hydrogen into?" and the following answer choices: 
- Renewable energy
 - Electrical energy
 - kinetic energy
 - electromagnetic energy
 - an engine
 - transportation technology
 - Solar energy
 - Oil

Now knowing that microbial fuel cells convert chemical energy into electrical energy and fuel cells are devices that directly convert hydrogen into electricity, choose the best answer.


 

  Electrical energy       