The agricultural practice of growing multiple crops together:

Monocropping
Crop rotation
Intercropping
Shifting cultivation

The correct answer is C. Intercropping is the agricultural practice of growing multiple crops together in the same field. It is a form of polyculture, and it is often used to improve soil fertility, reduce pests and diseases, and increase crop yields.

Monocropping is the practice of growing a single crop in a field year after year. This can lead to problems such as soil erosion, nutrient depletion, and pest and disease outbreaks.

Crop rotation is the practice of growing different crops in the same field in a planned sequence. This helps to prevent soil erosion and nutrient depletion, and it can also help to reduce pest and disease problems.

Shifting cultivation is a type of agriculture that is practiced in tropical areas. It involves clearing a small area of forest, planting crops, and then abandoning the area after a few years. This allows the forest to regenerate, and it also helps to prevent soil erosion.

In conclusion, the correct answer is C. Intercropping is the agricultural practice of growing multiple crops together in the same field. It is a form of polyculture, and it is often used to improve soil fertility, reduce pests and diseases, and increase crop yields.