The practice of agroforestry is promoted in Arunachal Pradesh to:

The correct answer is: d) All of the above.

Agroforestry is a land-use system that integrates trees and shrubs with crops or livestock. It has been promoted in Arunachal Pradesh to increase agricultural productivity, conserve soil and water, and provide additional income sources.

• Increase agricultural productivity: Agroforestry can increase agricultural productivity by providing shade and windbreaks for crops, improving soil fertility, and reducing soil erosion.
• Conserve soil and water: Agroforestry can conserve soil and water by reducing runoff and erosion, and by improving water infiltration.
• Provide additional income sources: Agroforestry can provide additional income sources through the sale of timber, fruits, nuts, and other products.

In addition to these benefits, agroforestry can also help to improve biodiversity, reduce greenhouse gas emissions, and mitigate climate change.