Final answer:
Soil that is mostly clay would have poor infiltration due to very small particle sizes, which create many small spaces that hold onto water tightly and reduce permeability.
Step-by-step explanation:
Among the options given, soil that is mostly clay would have poor infiltration. Clay particles are very small (less than 0.002 mm in diameter) and have many small spaces where water can reside. These small spaces create a cohesive and plastic material when wet, which can slow down water movement. In addition, the large number of small pores in clay soils leads to slow water flow and significantly reduces the rate of water infiltration. Clay soils hold onto water tightly and are less permeable than sand, leading to slower drainage and higher water retention.
On the other hand, sandy soils, soils with high amounts of microbes and fungi, and loosely packed soils tend to have better infiltration due to their larger pore spaces and overall texture, allowing water to move through more easily. Therefore, the correct answer to the question is b. Soil that is mostly clay.