Correct Option (d):
All three statements are incorrect.
Incorrect Options
Statement 1 is incorrect.
The Amarkantak Hills are located at the confluence of the Vindhya, Satpura, and Maikal ranges in central India. The Sahyadri Range is another name for the Western Ghats, which are geographically distinct and situated significantly to the southwest of the Amarkantak region.
Statement 2 is incorrect.
The Biligirirangan Hills (BR Hills) are situated in Karnataka and form part of the Eastern Ghats. The Satpura Range is a mountain range in central India, extending across Madhya Pradesh and Maharashtra, and is geographically separate from the BR Hills.
Statement 3 is incorrect.
The Seshachalam Hills are part of the Eastern Ghats, located in Andhra Pradesh, specifically in the Chittoor-Kadapa region. They do not constitute the southernmost part of the Western Ghats; the Western Ghats are a distinct mountain range along the western coast of India.