Which of the following statements about water is true?
- AWhen water is added to solid anhydrous cobalt(II) chloride, the solid turns blue.
- BWater containing dissolved sodium chloride boils at a temperature greater than $100^{\circ}\text{C}$.
- CAll dissolved metal ions found in natural sources of water are beneficial to life.
- DSoluble impurities are removed during the sedimentation stage in the treatment of drinking water.