A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the solution, a white precipitated is formed which does not dissolve I dilute nitric acid. The anion could be
A. `SO_(4)^(2-)`
B. `CO_(3)^(2-)`
C. `S^(2-)`
D. `Cl^(-)`