I think the answer is C). Floor Consideration because the passage something about the floor being open. That's my reasoning. I f it is not the correct answer and you get the correct answer please let me know because i am taking a test with this question it and i don't know the answer. So, thank you and I hope I helped.
Chinese subjects were forced to adopt the customs of the Mongolia people.
10) Roman Mosaics
9) The spear beares
8) Ixion Room, House of Vetti
7) Arch of Septimus
6) Column of Mareus
5) Arch of Constantine
4) Dionysus frieze, Villa of Mysteries
3) Altar of Augustan Peace
2) Column of Trajan
1) Fresco wall from house of Livia