The correct option is C The assertion is true but the reason is false.
Bioenergy is the largest renewable energy source which provides for 10% of world primary energy supply. It is derived from the conversion of biomass which refers to all organic matter derived from plants or animals on a renewable basis. Biomass includes wood and agricultural crops, herbaceous and woody energy crops, municipal organic wastes as well as manure. While fossil fuels are are also formed through the decomposition processes of buried dead organisms, they are considered as non-renewable sources of energy as it takes millions of years to form and the viable resources gets depleted faster than the production. Thus, the correct answer is option C.