During a chemical reaction, the blue compound $X$ was converted into the white compound $Y$. $X \rightarrow Y$ Which statement best describes this reaction?
- AHydrated cobalt(II) chloride is heated.
- BHydrated copper(II) sulfate is heated.
- CWater is added to anhydrous cobalt(II) chloride.
- DWater is added to anhydrous copper(II) sulfate.