Which of the following is a Megalithic site ?

Correct option is A

The answer is (a) Brahmagiri.
Megalithic sites are prehistoric monuments made of large stones. They are found all over the world, and are typically dated to the Neolithic and Bronze Ages. Brahmagiri is a megalithic site located in Karnataka, India. It is one of the largest and most important megalithic sites in India, and is believed to have been built between the 12th and 10th centuries BC. The site includes a number of megalithic monuments, including dolmens, menhirs, and stone circles.