A mixture contains salt, sand and sulfur. Salt dissolves in water but not in xylene. Sulfur dissolves in xylene but not in water. Sand does not dissolve in water or xylene. In which order should the processes be carried out to separate the salt, the sand and the sulfur from the mixture?
- Aadd water $\rightarrow$ filter $\rightarrow$ add xylene to the filtrate $\rightarrow$ filter
- Badd water $\rightarrow$ filter $\rightarrow$ add xylene to the residue $\rightarrow$ filter
- Cadd xylene $\rightarrow$ filter $\rightarrow$ add water to the filtrate $\rightarrow$ filter
- Dadd xylene $\rightarrow$ filter $\rightarrow$ add xylene to the residue $\rightarrow$ filter