A white sodium salt dissolves in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the solution, a white ppt. is obtained which does not dissolves in dil. `HNO_(3)` . The anion is
A. `CO_(3)^(2-)`
B. `Cl^(-)`
C. `SO_(4)^(2-)`
D. `S^(2-)`