What type of artwork is this known as that was used in
the Roman Empire?
A. Barrel vaulting
B. Free standing statue
C. Painting
D. Stone relief

Many of the art forms and methods used by the Romans – such as high and low relief, free-standing sculpture, bronze casting, vase art, mosaic, cameo, coin art, fine jewelry and metalwork, funerary sculpture, perspective drawing, caricature, genre and portrait painting, landscape painting, architectural sculpture

Explanation:

the federal government of the united states was established by the constitution. us is a presidential republic. the president is head of state, head of government and of a two party legislative and electoral system. the supreme court balances the powers of the federal and the state government. yhe executive branch is headed by the oresident. there are two chambers of congress, the senate and the house of representatives. judicial power is exercised by the judicial branch (or judiciary), comprised of the supreme court and lower federal courts. the judiciary's function is to interpret the   constitution as well as the federal laws and regulations.