The correct answer is option 1, agricultural products.

This means that the economy of South Sudan will primarily rely on the production and export of agricultural goods.

Option 2, minerals, refers to the mining and extraction of valuable minerals from the earth. While South Sudan does have some mineral resources, such as gold and iron ore, it currently lacks the infrastructure and investment necessary to fully exploit these resources on a large scale. Therefore, while minerals may contribute to some extent to the economy, they are not the primary source of income for South Sudan.

Option 3, forest products, refers to the harvesting and trade of timber and other forest resources. However, South Sudan has a limited amount of forest cover compared to other countries in Africa, making it less likely for the economy to heavily rely on forest products.

Option 4, fishery products, relates to the fishing industry, including the catch and sale of fish. While South Sudan does have some freshwater bodies such as the Nile River, the country`s fishery industry is relatively underdeveloped and does not play a significant role in its economy.

Overall, agricultural products are the main source of income for South Sudan, making it the most accurate option for this question.