A is the correct answer .
Please vote my answer branliest! Thanks.
Bulla, an amulet worn like a locket, was given to male children in Ancient Rome nine days after birth. ... Roman bullae were enigmatic objects of lead, for the well-off covered in gold foil. A bulla was worn around the neck as a locket to protect against evil spirits and forces.
one contribution was the Christian architecture
another one the "the code laws"
I wanna say it’s b:a democracy
Answer:
I think the Louisiana Purchase
hope this helped