Answer:
A. The amount of sunlight varies throughout the day
Step-by-step explanation:
Solar energy is one of the renewable energy resources that does not cause any pollution or harm to the environment. Tropical regions receive ample sunlight for the most part of the year and are best suited to use solar energy as an energy source. However, solar energy usage depends on the availability of sun in the sky that varies throughout the day and also exhibits seasonal changes. On the other hand, availability of fossil fuels does not vary on daily basis.