If the specific conductances of a sparingly soluble (1:1) salt (MW $=200\,\mathrm{g\,mol^{-1}}$) in its saturated aqueous solution at $25^{\circ}\mathrm{C}$ and that of water are $1.5 \times 10^{-3}\,\mathrm{ohm^{-1}\,dm^{-1}}$ and $1.5 \times 10^{-5}\,\mathrm{ohm^{-1}\,dm^{-1}}$, respectively, and the ionic conductances for its cation and anion at infinite dilution are 0.485 and $1.0\,\mathrm{ohm^{-1}\,dm^{2}\,mol^{-1}}$, respectively, the solubility (in $\mathrm{g\,L^{-1}}$) of the salt in water at $25^{\circ}\mathrm{C}$ is
(a)$1 \times 10^{-6}$
(b)$1 \times 10^{-3}$
(c)$2 \times 10^{-1}$
(d)$2 \times 10^{-4}$