The solubility product of $CaCO_3$ is $5 \times 10^{-9}$. Its solubility is equal to .......

  • A
    $2.2 \times 10^{-9}$
  • B
    $7 \times 10^{-5}$
  • C
    $2.5 \times 10^{-4}$
  • D
    $2.5 \times 10^{-5}$

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