Concept:Soil particles settle in water according to their density and particle size, with lighter materials remaining above heavier ones.Explanation:In soil sedimentation, heavier particles like gravel and sand settle first at the bottom.Silt settles above sand, while clay remains suspended longer as a cloudy layer.Organic matter is lighter than clay and floats above the clay suspension.Therefore, the particles found above the clay suspension are organic matter.Answer:B. Organic