The correct answer is option 3) Vindhyas. The Vindhyas mountain range runs in a north-south direction across central India, serving as a natural boundary between the northern and southern parts of the country. The Vindhyas are not as well-known or prominent as the Himalayas in the north or the Western Ghats in the south, but they still play an important geographical role in India. The Himalayas form a massive mountain range in the northern part of the country, while the Western Ghats are a mountain range along the western coast of India. The Satpura range, mentioned in option 4, is a part of the larger Vindhya range and is located in central India. Therefore, the correct answer is option 3) Vindhyas.