$\begin{array}{1 1}4.06g mol^{-1}\\3.06g mol^{-1}\\2.06g mol^{-1}\\1.06g mol^{-1}\end{array} $

According to Raoult's law,

$\large\frac{P^0-P_s}{P^0}=$$n_B=\large\frac{n_B}{n_A+n_B}$

$\Rightarrow \large\frac{n_B}{n_A}$

$\Rightarrow \large\frac{W_B\times M_A}{M_B\times W_A}$

(For dilute solutions,$n_B < < < n_A$)

$M_B=\large\frac{W_B\times M_A}{W_A}.\frac{P^0}{P^0-P_s}$

$\Rightarrow \large\frac{0.2\times 18}{99.8}\times \frac{1.013}{1.013-1.009}$

$\Rightarrow 4.06g mol^{-1}$

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