Agroforestry systems in Bihar can help:

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

Agroforestry systems in Bihar can help to improve soil fertility, provide fodder and fuelwood, and enhance biodiversity.

• Agroforestry systems can help to improve soil fertility by providing a source of organic matter, such as leaves and fallen branches, which can help to improve soil structure and nutrient cycling.
• Agroforestry systems can provide fodder and fuelwood, which can help to reduce pressure on natural forests.
• Agroforestry systems can enhance biodiversity by providing a habitat for a variety of plants and animals.

In addition, agroforestry systems can help to reduce soil erosion, improve water infiltration, and provide a buffer against extreme weather events.