Consider the following statement: "Acids are substances that dissociate in water to give hydrogen ions H⁺ (aq), and bases are substances that produce hydroxyl ions OH⁻ (aq)." The above statement is based on which one of the following concepts?

The given definition is the classical Arrhenius concept of acids and bases, proposed by Svante Arrhenius in 1884. He defined acids as substances that release H⁺ ions in aqueous solution and bases as substances that release OH⁻ ions in aqueous solution. The Brønsted-Lowry concept defines acids as proton donors and bases as proton acceptors (not requiring water). The Lewis concept defines acids as electron-pair acceptors and bases as electron-pair donors. Hence the statement matches the Arrhenius concept.