The correct answer is Acetic acid.
Acetic acid is a colorless liquid with a characteristic sour taste and pungent odor. It is produced naturally by the fermentation of sugars and starches by acetic acid bacteria. Acetic acid is also produced synthetically, and is used in a variety of products, including vinegar, food flavorings, and pharmaceuticals.
Tartaric acid is a white, crystalline solid that is found naturally in grapes, tamarinds, and other fruits. It is also produced synthetically, and is used in a variety of products, including baking powder, winemaking, and cosmetics.
Malic acid is a white, crystalline solid that is found naturally in apples, pears, and other fruits. It is also produced synthetically, and is used in a variety of products, including soft drinks, candies, and pharmaceuticals.
Oxalic acid is a white, crystalline solid that is found naturally in rhubarb, spinach, and other plants. It is also produced synthetically, and is used in a variety of products, including cleaning agents, rust removers, and wood bleaches.
Of the four options, only acetic acid is used for making vinegar.