Volume of a molecule is related to Van der Waal constant 'b' and Avogadro Number $\left({\mathrm{N}}_0\right)$ by equation 

According to van der waal equation,

Excluded Volume per molecule=$4\left(\frac{4}{3}{\mathrm{\pi r}}^3\right)$

Excluded volume per mole(b)=${\mathrm{N}}_{0}4\left(\frac{4}{3}{\mathrm{\pi r}}^3\right)$

So, b=${\mathrm{N}}_{0}4 \mathrm{V}$

$\mathrm{V}=\frac{\mathrm{b}}{4{\mathrm{N}}_0}$

Therefore, the correct option is D