Nutrient rich soil is found in the river deltas.
Answer: Option B
Step-by-step explanation:
The river delta contains soil that is deposited in the river bed by various rivers. These rivers flow through a large land surfaces and thereby bring in enormous amount of nutrient.
Each biotic environment will have a specific type of nutrient that are produced in abundance due to the type of organisms that dwell there, thereby a river delta will contain the silt that is deposited from the various environments through which the river is flowing.