Which accurately describes architectural achievements of the Roman Empire? a. The Romans built massive concrete structures like the Pantheon and Coliseum. The Romans built massive concrete structures like the Pantheon and Coliseum. , ,

b. The Romans built massive mud-brick ziggurats in ancient Mesopotamia. The Romans built massive mud-brick ziggurats in ancient Mesopotamia. , ,

c. The Romans built the Acropolis in Athens as a temple to the goddess Athena. The Romans built the Acropolis in Athens as a temple to the goddess Athena. , ,

d. The Romans built the temple of Delphi as a shrine to the god Apollo.