ANS:D - all the above.

1. The void space between the soil grains is filled partly with air and partly with water:
   • This statement describes the typical condition of soil, where the void spaces or pore spaces between soil particles contain both air and water. The amount of air and water in the soil depends on factors such as the moisture content, soil texture, and environmental conditions.
2. In perfectly saturated soil, the voids are completely filled with water:
   • This statement refers to the condition of saturated soil, where the void spaces between soil particles are completely filled with water. Saturated soil occurs when all the pore spaces are filled with water, leaving no room for air. This condition commonly occurs in areas with high water tables, during heavy rainfall, or in waterlogged soils.
3. In dry soil, the voids are completely filled with air:
   • This statement describes the condition of dry soil, where the moisture content is very low, and the void spaces between soil particles are filled with air. Dry soil occurs when water has evaporated or drained from the soil, leaving behind air in the pore spaces.