The plants are the factor in this marsh which are biotic. Thus, the correct option is C.
Biotic factors may be defined as any living thing that possesses a significant effect on an ecosystem. It includes all forms of living entities like producers (plants), consumers, decomposers, etc.
Among the given options, oxygen is a gas, clouds are suspended crystal particles, and water is a molecule. All of them do not have any close characteristics or properties similar to living entities. So, all of them are categorized under abiotic forms.
Plants are the producers of any ecosystem that synthesize their own food in the presence of carbon dioxide and water with the help of sunlight through the process of photosynthesis.
Therefore, the plants are the factor in this marsh which are biotic. Thus, the correct option is C.
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