Which are the bases of the above reaction $HCl_{(aq)} + H_2O_{(aq)} \rightleftharpoons H_3O^{+}_{(aq)} + Cl^{-}_{(aq)}$? Which base is weak?

• A
  $H_2O$ and $Cl^{-}$; $Cl^{-}$ is the weak base.
• B
  $HCl$ and $H_3O^{+}$; $HCl$ is the weak base.
• C
  $H_2O$ and $Cl^{-}$; $H_2O$ is the weak base.
• D
  $HCl$ and $Cl^{-}$; $Cl^{-}$ is the weak base.