Answer:
C Soil conservation
Explanation:
Soil conservation is said to be done when the soil is protected from getting washed away due to erosion from climatic factors or other man made factors like using the soil too much for cultivation. Soil must also be protected from salts getting deposited in it at harmful levels.
Whenever the soil gets eroded due to environmental factors or when the soil is no longer able to support the growth of crops or vegetation, soil is said to be exhausted. It is soil exhaustion.
