Percent pore space can be calculated by using of which formula

Answer: Option B

Percent pore space is defined by the porosity of a material possessing free space between the mineral grains expressed in percentage. It is proposed by Rebollo et al., 1996.
It depends on the size and sorting of the particles as a cubic or hexagonal package.
$$\%\text{PS}=100-\left(\frac{{\text{D}}_{\text{b}}}{{\text{D}}_{\text{p}}}\times 100\right)$$