The answers in order are C,A,C,B,D,A,B,D,A, and A
Yes it is the most important element of art because with it u wont have art.
Many official buildings built in the US are very strongly influenced by Greek and Roman architecture. The most obvious being the White House, which displays Roman and Greek influences in the arches and columns on the exterior, and in the windows seen on the White House. While initially developed by the Greeks, arches and other architectural designs were incorporated by the Romans and can still be seen within ancient Roman architecture. Many Greek designs still resonate and "echo" into modern western architecture to this day.
Hope this helps :)
2) they could have images and symbols that tell a story
1) they could be made of glazed and baked mud bricks or of carved stone
3) they could protect a city and show the strength and power of a ruler
are the correct answers
impressionism is an answer i think