The correct answer is: A. never be greater than 100 %.
The water content of soil is the ratio of the mass of water in the soil to the mass of dry soil. It is expressed as a percentage. The maximum water content that a soil can hold is 100%. This is because the soil particles can only hold so much water before they become saturated. If the soil is saturated, any additional water will simply run off or drain away.
Option B is incorrect because the water content of soil can take values from 0% to 100%. Option C is incorrect because the water content of soil cannot be less than 0%. Option D is incorrect because the water content of soil cannot be greater than 100%.