Concept:Soil moisture retention depends on particle size and pore spaces; finer soils hold more water.Explanation:Clay has the smallest particles, giving it a large total surface area and many tiny pore spaces that hold water tightly.Sand has large particles and large pores, so water drains quickly.Loams are intermediate, and sand loam or clay loam hold less water than pure clay.Thus, among the listed options, clay retains the greatest amount of moisture.Answer:D. clay
