Concept:Percentage moisture content is the weight lost after oven-drying, expressed as a percentage of the original fresh weight.Explanation:Fresh weight of soil = 25kgOven-dry weight of soil = 20kgLoss in weight due to moisture = 25−20=5kgPercentage moisture content = 255×100=20.0%Thus, the correct choice is option C.Answer:20.0% (Option C)