The correct answer is option 2, Palk Strait.
Palk Strait is a waterway that separates India from Sri Lanka. It is a narrow strait that lies between the Tamil Nadu state of India and the Northern Province of Sri Lanka. The strait connects the Bay of Bengal in the northeast with the Gulf of Mannar in the southwest.
Option 1, Eight Degree Channel, is not the correct answer. The Eight Degree Channel is a waterway that separates the Andaman and Nicobar Islands from the northern part of Sumatra Island.
Option 3, Teh Degree Channel, is not a correct answer either. There is no such waterway named Teh Degree Channel.
Option 4, Andaman Sea, is not the correct answer as well. The Andaman Sea is a body of water to the southeast of the Bay of Bengal, and it does not separate India from Sri Lanka.
Therefore, the correct answer is option 2, Palk Strait, as it is the waterway that separates India from Sri Lanka.