Correct Answer: (4) Gulf of Mannar and Palk Gulf
Solution:Adam's Bridge also known as Rama Setu is a chain of limestone shoals, between Pamban Island, also known as Rameswaram Island. off the south-eastern coast of Tamil Nadu, India, and Mannar Island, off the north-western coast of Sri Lanka. The bridge separates the Gulf of Mannar from the Palk Strait. In 2005, the Government of India approved a multi-million dollar Sethusamudram Shipping Canal Project that aims to create a ship channel across the Palk Strait by dredging the shallow ocean floor near Dhanushkodi.