Clay and humus have a high water retaining capacity.
Among the options provided, clay and humus have a high water retaining capacity. Clay particles are small and have a high surface area, allowing them to hold water tightly. Humus, on the other hand, is organic matter that helps to improve the soil structure and porosity, allowing it to hold more water. Loam is a soil type that contains a mixture of clay, sand, and silt, so its water retention capacity can vary depending on the proportions of these components. Sand has low water retaining capacity due to its large particle size and poor moisture retention ability. The option "latrine" is not related to soil or water retention capacity.
