Final answer:
Diversification of the economy is necessary for sustainable development in developing countries that mainly produce raw products, such as mining and agricultural goods.
Step-by-step explanation:
In the case of developing countries that mainly produce raw products, such as mining and agricultural goods, the best path for economic development is c. Diversification of the economy. Relying solely on exporting raw materials is not sufficient for long-term sustainable growth. By diversifying the economy and investing in other sectors such as manufacturing and services, countries can reduce their reliance on volatile commodity prices and create a more stable and resilient economy.