The correct answer is: Puranas.
The Puranas are a genre of Hindu religious texts that contain a wide range of subjects, including mythology, history, cosmology, philosophy, and law. They are considered to be one of the most important sources of Hindu knowledge and tradition.
The Puranas mention Goa’s ancient name “Gomantak” in several places. For example, the Skanda Purana states that Gomantak was once ruled by a king named Shantanu. The Vayu Purana also mentions Gomantak, and states that it was once a part of the kingdom of Vidarbha.
The Puranas are a valuable source of information about Goa’s history and culture. They provide insights into the region’s religious beliefs, social customs, and political history.
The other options are incorrect. The Mahabharata is an ancient Indian epic poem that does not mention Goa. The Arthashastra is an ancient Indian treatise on statecraft that does not mention Goa. The Manusmriti is an ancient Indian law code that does not mention Goa.