Acetic acid, which is option 3, is an organic acid. Organic acids are a type of compound that contains carbon and hydrogen atoms in their molecular structures. Acetic acid, also known as ethanoic acid, has the chemical formula CH3COOH. It is a weak acid and is commonly found in vinegar.

Option 1, Hydrochloric acid, is not an organic acid. It is an inorganic acid that is composed of hydrogen and chlorine (HCl). Hydrochloric acid is a strong acid and is commonly used in laboratories and industrial settings.

Option 2, Nitric acid, is also an inorganic acid. Its chemical formula is HNO3 and it is made up of hydrogen, nitrogen, and oxygen atoms. Nitric acid is a strong acid and is commonly used in various chemical processes and as a laboratory reagent.

Option 4, Sulphuric acid, is another inorganic acid. It has the formula H2SO4 and is composed of hydrogen, sulfur, and oxygen atoms. Sulphuric acid is a strong acid and is widely used in industries such as fertilizer production, petroleum refining, and battery manufacturing.

Therefore, the correct answer is option 3, Acetic acid, as it is the only