At $\mathrm{T}(\mathrm{K}) \mathrm{K}_{\mathrm{sp}}$ of two ionic salts $\mathrm{MX}_2$ and MX is $5 \times 10^{-13}$ and $1.6 \times 10^{-11}$ respectively. The ratio of molar solubility of $\mathrm{MX}_2$ and MX is

• Correct answer
  A

  $12.5$
• B

  $1.25$
• C

  $6.25$
• D

  $7.50$

Hence, the correct answer is option: 'A'.