Answer:
A. Hydropower(Water cycle)
B. Plants(Photosynthesis)
C. Sun(Nuclear fusion
D. Fossil fuels(Plant life decay)
Step-by-step explanation:
Hydropower can be regarded as water power which as a result of energy gotten from running water i.e water cycle
Plants are multicellular organisms and they can produce their food on their own, they utilize the process of photosynthesis.
Nuclear fusion involves coming together of two atomic nuclei , energy is involved
.
fossil fuel is one that is formed as a result of decomposition of dead organisms of many years and it involves some cycle of plants or animals decay