Which is a definition of fermentation?

Question

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Fermentation is a metabolic process that produces chemical changes in organic substrates through the action of enzymes. It is indeed the breaking down of materials by microorganisms in an oxygen-free environment (A), is also known as anaerobic decomposition (B), and can contribute to global warming through the production of methane, a potent greenhouse gas, during the decomposition of organic waste in anaerobic conditions (C).

Which Is a Definition of Fermentation