Jake wants to enrich the nitrogen content of his soil through fixation. which crop can he use for this purpose? wheat sugarcane cashew nuts alfalfa

The appropriate answer is D. Alfalfa. Alfalfa is a legume and these plants play a key role in the nitrogen cycle. These plants house nitrogen fixing bacteria on their roots. The bacteria are housed in tiny round structures of leguminous plant roots. Once the nitrogen is fixed in the soil it can now be used by other plants to make food.  These plants include beans peas and peanuts.  

The answer is a i believe

The answer is b. hope this !