Efforts to improve soil fertility in Meghalaya include:

The correct answer is: d) All of the above

• Organic fertilizers are made from natural materials such as animal manure, compost, and plant residues. They can help to improve soil fertility by adding nutrients, improving drainage, and increasing water retention.
• Terrace farming is a method of farming that involves creating terraces on sloping land. This helps to reduce soil erosion and improve water retention.
• Agroforestry is a system of farming that integrates trees with crops and livestock. This can help to improve soil fertility by providing shade, reducing erosion, and adding nutrients.

All of these methods can help to improve soil fertility in Meghalaya. However, it is important to note that the best method for a particular area will depend on the specific soil conditions and farming practices.