The correct answer is: a) Megalithic structures.
Megalithic structures are large stone monuments that were built by ancient peoples. They are found all over the world, and they come in a variety of shapes and sizes. Some of the most famous megalithic structures include Stonehenge in England, the Pyramids of Giza in Egypt, and the Easter Island Moai.
The Malinithan archaeological site is located in the Philippines. It is home to a number of megalithic structures, including stone circles, dolmens, and menhirs. These structures are believed to have been built by the ancient Tabon people, who lived in the area between 4,000 and 2,000 years ago.
The megalithic structures at Malinithan are significant because they provide evidence of the early development of human culture in the Philippines. They also offer insights into the beliefs and practices of the Tabon people.
The other options are incorrect because they do not accurately describe the Malinithan archaeological site. Temple ruins are not found at the site, and cave paintings and pottery fragments are not as significant as the megalithic structures.