Clay and humus particles, known as colloids, measure less than 0.002 mm. Because of their tiny size, colloids possess ________________ surface area that facilitates adsorption, catalysis, precipitation, and microbial colonization:
Explanation
Option A is correct because colloids, being very small particles, have an extremely low surface area, which limits their capacity for adsorption, catalysis, precipitation, and microbial colonization.