Which is a correct characteristic of clay in soil?

Clay is characterized by having the smallest mineral particles among the soil types. These tiny particles give clay its unique properties, including a high specific surface area, which enables it to have excellent nutrient-holding capacity. This means that clay can retain essential nutrients and water, making it an important component for plant growth. Consequently, this ability to hold nutrients is beneficial for agricultural practices and ecosystem sustainability.

The other options describe characteristics that do not align with the properties of clay. For instance, fast drainage with high aeration applies more to sandy soils, which consist of larger particles allowing for better drainage and aeration. Medium-sized particles suggest a balance typical of loamy soils, while the mention of the largest mineral particles reflects the characteristics of sand or gravel, which have poor nutrient-holding capacities. Each of these options misrepresents the fundamental aspects of clay, emphasizing why the choice that refers to clay's small particles and nutrient retention is appropriate.