Megaliths have been identified as

The correct answer is (b), burial sites. Megaliths are large stones that have been erected by humans. They are often found in groups, and they can be used for a variety of purposes, including burial, religious ceremonies, and astronomical observations. Megaliths are found all over the world, and they date back to the Neolithic period.

(a) Caves for hermits is incorrect because megaliths are not typically found in caves.

(c) Temple sites is incorrect because megaliths are not always used for religious purposes.

(d) None of the above is incorrect because megaliths have been identified as burial sites.