Energy sources are the mandatory for day to day activities. The correct order of this is first biomass energy was discovered, then fossil fuels and then fuel cells, i.e., option a.
What are different energy sources?
Energy sources can be either renewable or non-renewable, based on its origin.
The one that cannot be exhausted are called renewable resources, example air, water, etc.
The one that can be exhausted due to overuse is non-renewable resource, example fossil fuels, coals, etc.
The correct order of the energy resources discovered by humans is first biomass energy, fossil fuels, and finally fuel cells.
Thus, the correct option is a.
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