Concept:Fermentation of sugars or starch produces ethanol, but vinegar is already an oxidation product of ethanol.Explanation:Cane sugar and glucose are fermentable sugars.Starch can be broken down into glucose before fermentation.All three can therefore produce ethanol.Vinegar is dilute acetic acid (CH3COOH).It is formed when ethanol is further oxidised, so it cannot be fermented to give ethanol.Answer:D. Vinegar