Answer: D. A soil that is 10 percent sand, 80 percent clay, and 10 percent silt.
A soil is an aggregate of sediments that is obtained after weathering of rocks, and organic matter being added by the biological activities of the living beings like decomposition of dead and decaying organisms.
Clay is a type of soil that has fine grained particles, it has better minerals and water retention capacity than other soils like sand and silt. This makes the clay more fertile over other soils and will be suitable for gardening. Therefore, the soil composition having more amount of clay in the soil composition will be the best soil for gardening.
Hence, A soil that is 10 percent sand, 80 percent clay, and 10 percent silt is a correct option.