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The correct answer is option 3 - Palk Straits. The Pamban Railway Bridge is located over the Palk Straits.
Let`s examine the other options to understand why they are not the correct answers.
Option 1 - Nilgiris: The Nilgiris is a mountain range located in southern India, but it does not have any connection to the Pamban Railway Bridge.
Option 2 - Krishna delta: The Krishna delta is a region in the state of Andhra Pradesh, India. Although it is a popular tourist destination, it is not the location of the Pamban Railway Bridge.
Option 4 - Malabar coast: The Malabar coast is a region along the southwestern coast of India, but it is not associated with the Pamban Railway Bridge.
Therefore, the correct answer is option 3 - Palk Straits. The Pamban Railway Bridge, which is more than 2 km long, is located over the Palk Straits and is a major tourist attraction in the region.