$A$ mixture of $100 \ mmol$ of $Ca(OH)_2$ and $2 \ g$ of $Na_2SO_4$ was dissolved in water and the volume was made up to $100 \ mL$. The mass of $CaSO_4$ formed and the concentration of $OH^{-}$ in the resulting solution,respectively,are:
(Molar mass of $Ca(OH)_2$,$Na_2SO_4$ and $CaSO_4$ are $74$,$142$ and $136 \ g \ mol^{-1}$ respectively; $K_{sp}$ of $Ca(OH)_2$ is $5.5 \times 10^{-6}$)

• A
  $1.9 \ g, 0.28 \ mol \ L^{-1}$
• B
  $13.6 \ g, 0.28 \ mol \ L^{-1}$
• C
  $1.9 \ g, 0.14 \ mol \ L^{-1}$
• D
  $13.6 \ g, 0.14 \ mol \ L^{-1}$