Correct option is B
Solution:Air-Space Ratio is defined as the ratio of the volume of airto the volume of soil solids in a given soil mass.Air-Space Ratio=Volume of solidsVolume of airAir-Space Ratio=VsVaWhere,Va=Volume of air voidsVs=Volume of soil solidsTherefore, the ratio of the volume of air space to thevolume of solids is called the Air-Space Ratio.Hence, the correct answer is Option B: Air-Space Ratio.