The correct answer is: a) The Himalayas and Northeast India.
The Kirata people are an ethnic group indigenous to the Himalayas and Northeast India. They are mentioned in ancient Hindu texts like the Mahabharata and the Ramayana. The Kirata are believed to be the original inhabitants of the Himalayas and Northeast India. They are a diverse group with a variety of languages and cultures. The Kirata are known for their physical strength and their skills in archery and warfare. They have played an important role in the history of the Himalayas and Northeast India.
Option b) is incorrect because Central India is not a region where the Kirata people are believed to have inhabited.
Option c) is incorrect because the Deccan Plateau is not a region where the Kirata people are believed to have inhabited.
Option d) is incorrect because coastal regions are not a region where the Kirata people are believed to have inhabited.