(B) In an aqueous solution,an acid releases $H^{+}$ ions. These $H^{+}$ ions are highly reactive and immediately combine with water molecules $(H_2O)$

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(B) In an aqueous solution,an acid releases $H^{+}$ ions. These $H^{+}$ ions are highly reactive and immediately combine with water molecules $(H_2O)$ to form hydronium ions $(H_3O^{+})$. Therefore,the characteristic species of an acid in an aqueous medium is the $H_3O^{+}$ ion.