Terrace cultivation in Meghalaya is mainly used for growing:

Rice
Maize
Wheat
Jute

The correct answer is: a) Rice.

Terrace cultivation is a type of agriculture that is used in mountainous areas. It involves building terraces on the sides of hills or mountains to create flat surfaces for growing crops. Terrace cultivation is used in many parts of the world, including Meghalaya in India.

Rice is the main crop that is grown in terraced fields in Meghalaya. Rice is a type of grass that is grown in flooded fields. It is a staple food for millions of people around the world. Rice is a good source of carbohydrates, protein, and vitamins.

Maize, wheat, and jute are also grown in Meghalaya, but they are not as important as rice. Maize is a type of grain that is used to make cornbread, tortillas, and other foods. Wheat is a type of grain that is used to make bread, pasta, and other foods. Jute is a type of fiber that is used to make rope, bags, and other products.

Terrace cultivation is a sustainable way to farm in mountainous areas. It helps to prevent soil erosion and landslides. It also helps to conserve water. However, terrace cultivation can be labor-intensive and expensive to set up.