Here's why:

* No mitochondria required: Fermentation is an anaerobic process, meaning it doesn't require oxygen. The mitochondria, the powerhouse of the cell, are involved in aerobic respiration (which does require oxygen).

* Enzymes in cytoplasm: The enzymes responsible for the fermentation process are located within the cytoplasm.

While the cytoplasm is the primary location for fermentation, it's important to note that some specific types of fermentation (like lactic acid fermentation) can occur in specific organelles like muscle cells, but the main process still takes place in the cytoplasm.