Answer :
Final answer:
Crop rotation is the best method to replenish topsoil.
Explanation:
The correct answer is C. Crop rotation. Crop rotation is a practice where different crops are planted in the same area over different seasons or years. It helps to improve soil fertility and prevent the depletion of topsoil. By rotating crops, the nutrients required by each crop are replenished, reducing the need for synthetic fertilizers. For example, planting legumes such as beans or peas one season can help fix nitrogen in the soil, benefiting the next season's crop.
Learn more about crop rotation here:
https://brainly.com/question/30172802
