The ultimate source of energy for the earth's living things is sunlight. So the correct option is B.
The radiation coming from the sun which is harnessed by various processes to produce chemical energy, electrical energy, heat energy, etc is called solar energy.
Solar energy is the ultimate source of energy due to which all other sources of energy have derived their energy.
The solar energy that is provided to the earth is in excess and more than required for meeting the requirements of the world today and even in the future.
This source of energy just needs proper methods of harvesting so that it can be used effectively.
Solar energy is a renewable source of energy. It also does not cause any pollution. Therefore, it is much more advantageous than fossil fuels which are exhaustible and majorly polluting sources of energy.
Thus, the source of energy for all living things is sunlight.
Therefore the correct option is B.
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