Concept:Clayey soil has very fine particles that pack tightly, causing poor drainage and waterlogging.
Explanation:Clay particles are small and leave little space for air.
This soil holds water strongly and drains very slowly.
During rainfall, water fills the pore spaces and stays there.
As a result, the soil becomes waterlogged.
Waterlogged soil lacks oxygen, so plant roots suffocate and rot.
Therefore, thick vegetation cannot grow well in clayey soil.
Answer:C. tendency of becoming waterlogged