Which of these methods of soil conservation would allow a farmer to add nutrients to soil wile also preventing erosion from crop fields. a. shelterbelts . b cover crops . c countour plowing . d no-till farming

The correct option is B.
A cover crop is a crop that is purposely grown for the enrichment of the soil. Cover crop is used principally to improve the quality of the soil and to prevent erosion and run off. Cover crops prevent erosion by holding the soil particles together with their root, their decaying matter also serve to increase the fertility of the soil.

B) an efficient process

You need to re ask the question with proper