Calculate the molality of a solution of sodium hydroxide which contains 0.2 g of NaOH in 50 grams of the solvent

Question

$\begin{array}{1 1} (a) \;0.0001\;m \\ (b)\;0.001\;m \\(c)\; 0.1\;m \\ (d)\;1\;m \end{array}$