At ${30}^0\mathrm{C}$ the solubility of ${\mathrm{Ag}}_2{\mathrm{CO}}_3 \left({\mathrm{K}}_{\mathrm{SP}} = 8 \times {10}^{-12}\right)$ would be greatest in one litre of

• A

  $0.05 \mathrm{M} {\mathrm{Na}}_2{\mathrm{CO}}_3$

• B

  $0.05 \mathrm{M} {\mathrm{AgNO}}_3$

• C

  Pure water

• D

  $0.05 \mathrm{M} {\mathrm{K}}_2{\mathrm{CO}}_3$