The correct answer is: Agriculture.
The Indo-Gangetic Plains are a vast, fertile region in South Asia that is home to over half of the world’s population. The region is well-suited for agriculture due to its rich soil, abundant water supply, and warm climate. The Ganges River, which flows through the region, is the largest river in India and is a major source of irrigation water. The region also has a long history of agriculture, dating back to the Indus Valley Civilization.
Forestry is not a major industry in the Indo-Gangetic Plains. The region is home to a variety of forests, but these forests are under threat from deforestation and other human activities.
Mining is also not a major industry in the Indo-Gangetic Plains. The region does have some mineral resources, but these resources are not as abundant as in other parts of the world.
Tourism is a growing industry in the Indo-Gangetic Plains. The region is home to many historical and cultural sites, as well as natural attractions such as the Himalayas.
In conclusion, the Indo-Gangetic Plains are ideal for agriculture. The region has a rich history of agriculture, and the land is well-suited for growing crops. The Ganges River provides a major source of irrigation water, and the climate is warm and humid.