The correct answer is: a) Traditional farming.
Traditional farming is the primary agricultural activity in Arunachal Pradesh. It is a subsistence form of agriculture that is based on the cultivation of rice, maize, millet, and other crops. Traditional farming is labor-intensive and relies on traditional methods of cultivation, such as the use of hand tools and animal labor.
Horticulture is the cultivation of fruits, vegetables, and other plants for food or ornamental purposes. It is a more intensive form of agriculture than traditional farming and requires the use of modern methods of cultivation, such as the use of machinery and fertilizers.
Plantation agriculture is a type of agriculture in which large areas of land are devoted to the cultivation of a single crop. Plantation agriculture is often associated with the use of forced labor and the exploitation of natural resources.
Livestock rearing is the raising of animals for food, fiber, or labor. It is a common practice in many parts of the world, including Arunachal Pradesh. Livestock rearing can be a sustainable form of agriculture, but it can also be harmful to the environment if it is not done in a responsible way.
In conclusion, the primary agricultural activity in Arunachal Pradesh is traditional farming. It is a subsistence form of agriculture that is based on the cultivation of rice, maize, millet, and other crops. Traditional farming is labor-intensive and relies on traditional methods of cultivation, such as the use of hand tools and animal labor.