The correct answer is A. the Vindhya range.
The Vindhya range is a mountain range that runs through central India, forming a natural boundary between the Indo-Gangetic Plain to the north and the Deccan Plateau to the south. The Vindhyas are the oldest mountain range in India, and they are thought to have formed over 250 million years ago. The range is made up of a series of parallel ridges and valleys, and it reaches a maximum elevation of 1,000 meters (3,280 feet).
The Vindhyas are an important geological feature in India, as they play a role in the country’s climate and rainfall patterns. The range also has a rich cultural history, and it is home to many ancient temples and monuments.
The other options are incorrect. The Aravallis are a mountain range that runs through northwestern India. The Nilgiri hills are a mountain range that runs through southern India. The Satpwas are a plateau that lies in central India.
The Vindhya range is the main dividing line between the geological regions of the Indo Gangetic plain and the peninsula because it is the highest and most continuous mountain range in the region. The Vindhyas form a natural barrier between the two regions, and they have a significant impact on the climate and rainfall patterns of both regions.