Correct Option: A

For calculating national income, the Indian economy is divided into 14 broad sectors, which are then grouped into three main categories A, B and C. In India, agriculture, forestry and logging, fishing, mining and quarrying, registered manufacturing and construction units are included in category A. The output method is applied to category A. The value added by this category is found by subtracting the value of raw materials and other inputs from the aggregate of commodity-wise output.