Question

which soil can retain more water why

Answer 1

The soil's ability to retain water is strongly related to particle size; water molecules hold more tightly to the fine particles of a clay soil than to coarser particles of a sandy soil, so clays generally retain more water.

Answer 2

The clay soil has the highest water holding capacity.
REASON:--->
Clay particles are so tiny and have many small pores spaces that make water move slower.