Concept:Properties of acids: they turn blue litmus red, react with bases (neutralisation) and taste sour.Explanation:I. False: acids turn blue litmus red. It is bases that turn red litmus blue.II. True: an acid and a base neutralise each other to form a salt and water.III. True: citrus fruits (oranges, lemons, limes) contain citric acid.Answer:Option B (II and III only)