The correct answer is D. Crop rotation is an important practice for all of the above.
Crop rotation is the practice of growing different types of crops in the same field in a planned sequence over a period of years. This helps to improve soil fertility, control pests and diseases, and increase crop yields.
Soil fertility is the ability of a soil to provide the essential nutrients that plants need to grow. When different types of crops are grown in the same field, they take up different nutrients from the soil. This helps to prevent the soil from becoming depleted of any one nutrient.
Pests and diseases can damage crops and reduce yields. Crop rotation can help to control pests and diseases by disrupting their life cycles. When different types of crops are grown in the same field, pests and diseases that attack one type of crop are not as likely to attack other types of crops.
Crop yields are the amount of crop that is produced per unit of land. Crop rotation can help to increase crop yields by improving soil fertility and controlling pests and diseases.
In addition to the benefits listed above, crop rotation can also help to reduce soil erosion, improve water infiltration, and increase biodiversity.