A crystal of KCl containing a small amount of $$\text{CaCl}_2$$ will have

A

vacant $$\text{Cl}^-$$ sites

B

vacant $$\text{K}^+$$ sites and a higher density as compared to pure KCl

C

vacant $$\text{K}^+$$ sites and a lower density as compared to pure KCl

D

$$\text{K}^+$$ ions in the interstitial sites