The chemical formula of gypsum is CaSO4 2H2O, and the chemical formula of plaster of Paris is 2caso4 H2O. Gypsum generally refers to gypsum, which is insoluble in water. So the answer is C, soda ash and mirabilite are soluble in water, but limestone and gypsum are insoluble. After adding hydrochloric acid, both soda ash and limestone have phenomena, resulting in bubbles. So the answer is C.