The solubility product of $AgCl$ is $1.8 \times 10^{-10}$. Precipitation of $AgCl$ will occur by mixing which of the following solutions when mixed in equal volume?

• A
  $10^{-8} \ M \ Ag^{+}$ and $10^{-8} \ M \ Cl^{-}$ ions
• B
  $10^{-3} \ M \ Ag^{+}$ and $10^{-3} \ M \ Cl^{-}$ ions
• C
  $10^{-6} \ M \ Ag^{+}$ and $10^{-6} \ M \ Cl^{-}$ ions
• D
  $10^{-10} \ M \ Ag^{+}$ and $10^{-10} \ M \ Cl^{-}$ ions