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The correct answer identifies Class 1 and 2 soil structures as suitable for soil absorption systems. This classification is based on the characteristics of these soil types, which include their texture, permeability, and drainage capabilities.

Class 1 soils typically consist of sandy or loamy textures that allow for good drainage and adequate absorption of liquid. These soils tend to have larger pores, facilitating the movement of water and air, which is essential for the biological processes involved in treating wastewater in absorption systems.

Class 2 soils generally encompass silty loams and similar textures. While they may retain moisture better than Class 1 soils, they still possess sufficient permeability to promote effective drainage without leading to water saturation. This balance allows for efficient nutrient absorption and minimizes the risk of surface runoff or saturation.

Soil absorption systems rely on these properties to function effectively, ensuring that treated effluent can percolate into the ground and be properly assimilated by the surrounding soil. Using soils classified outside of Class 1 and 2 could compromise the efficiency of the absorption system, potentially leading to environmental concerns such as groundwater contamination.