What is the molar concentration of a solution with 32 grams of $SO_2$ in 0.5 liter solution?

Question

$\begin{array}{1 1} (a)\;1\;mole/liter\\(b)\;2\;mole/liter \\ (c)\;3\;mole/liter \\ (d)\;4\;mole/liter \end{array} $