The main energy source for the reaction would depend on the context of the reaction in question. However, if we are discussing a process like photosynthesis, the answer would be:
A. Sunlight
If the reaction involves some type of combustion where methane is burned, then it would be:
B. Methane
For biochemical reactions involving energy storage, starch could be considered a source of energy. However, without specific context, the most common answer related to natural processes is:
A. Sunlight
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