I need help please this is my final

Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy

Combustion is the act or process of burning. therefore, i believe the answer is  a: burning wood. 

Hope you find the answer

Is there any options, for this