The main source of national income of India is-

Explanation

As per updated data, with reference to the given options, industry is the main source of India’s national income. However, overall, the services sector contributes the most to gross value added (GVA). According to the Provisional Estimates (2024–25) released on 30 May 2025, the shares of the primary, secondary and tertiary sectors in nominal GVA are 19.7%, 25.3% and 55.0% respectively.