Concept:Heavy soil is clay soil, which has fine, tightly packed particles that allow it to hold a large amount of water.
Explanation:Clay has the smallest particle size among soil types.
These tiny particles pack closely together, leaving only narrow spaces between them.
As a result, water moves through clay very slowly, so drainage is poor.
This slow drainage makes the soil retain a high quantity of water.
Clay particles also absorb water and swell, adding to the weight of the wet soil.
Therefore, such soils are described as heavy soils because of their high water-holding capacity.
Answer:A. have high water holding capacity.