Concept:Fermentation is a biological process used in processing some farm produce to develop flavour, remove mucilage, or improve preservation.
Explanation:Cocoa beans need fermentation to break down the pulp and create their characteristic chocolate flavour.
Coffee beans also require fermentation to remove the outer mucilage and enhance the bean's quality.
Cassava tubers are often fermented during the production of products like gari and fufu.
Rice grains, however, are normally processed by threshing, drying, and milling.
No fermentation step is needed for rice grain processing.
Therefore, the farm produce that does not require fermentation is rice grains.
Answer:D. rice grains