Two dilute solutions, A and B are prepared by dissolving two completely dissociable solutes, MA (Mol wt. X) and $\mathrm{M}^{\prime} \mathrm{A}_2$ (Mol wt. 2X) in water, respectively. Each solution contains $W_2 g$ of the respective solute, dissolved in $W_1 g$ of water. If the elevation of boiling point of $A$ and $B$ are measured to be $\Delta T_b(A)$ and $\Delta T_b(B)$ respectively, the ratio $\Delta \mathrm{T}_b(\mathrm{~A}) / \Delta \mathrm{T}_b(\mathrm{~B})$ would be

• A

  $3 / 2$
• Correct answer
  B

  $4 / 3$
• C

  $2 / 3$
• D

  $1 / 3$

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