Explanation:

Due to Green revolution the area under cultivation increased from 13 crore hectare to 19 crore hectare. The correct option is B..

The Green Revolution was a period that began in the 1960s during which agriculture in India was converted into a modern industrial system by the adoption of technology, such as the use of high yielding variety (HYV) seeds, mechanised farm tools, irrigation facilities, pesticides and fertilizers. Mainly led by agricultural scientist M. S. Swaminathan in India, this period was part of the larger Green Revolution endeavor initiated by Norman E Borlaug, which leveraged agricultural research and technology to increase agricultural productivity in the developing world.