Answer:
A. Megaliths
Explanation:
Megaliths are pre-historic architectural elements. They are placed like the monuments, sometimes connected with the place of the burial. Megaliths could be placed in a group (circle, wall, etc), or be just a simple stone making the monument.
The exact intend for the monument is still the cause of debate among the archeologist, though it is evident some are placed as the marker for the burial ground. Sometimes, they would even be made as a coffin to hold the bodies, and sometimes they would just mark the place of the grave. Yet, not all megaliths are tombs – there are many of them all over the world, and their function likely differs.
Probably the most known megalith is Stonehenge in the UK, which is Europe's most preserved group of megaliths in a circular form/
