The correct answer is option 1: to increase the productivity of the land. Crop rotation is a farming practice where different crops are planted in the same field in a specific sequence or order. This practice helps improve the overall health and quality of the soil by reducing soil erosion, preventing nutrient depletion, and controlling pests and diseases. By rotating different crops, farmers can break pest and disease cycles and reduce the build-up of pests and diseases that target specific crops. Additionally, different crops have different nutrient requirements, so rotating crops can help replenish the soil with specific nutrients needed by different plants. Ultimately, this leads to increased productivity of the land, as the soil remains fertile and nutrients are utilized efficiently by different crops.