River water from a chalk-rich agricultural region contains $\text{Ca}^{2+}$, $\text{Mg}^{2+}$, $\text{CO}_3^{2-}$, $\text{HCO}_3^-$, $\text{Cl}^-$ and $\text{NO}_3^-\,$ ions. At a water treatment plant, this water is processed by adding a calculated amount of calcium hydroxide. Which substances will precipitate from the river water after the calcium hydroxide has been added?
- A$\text{CaCl}_2$
- B$\text{CaCO}_3$
- C$\text{Ca(NO}_3)_2$
- D$\text{Mg(NO}_3)_2$