Which statement about the Sui Dynasty is correct?
A.It was the last Chinese dynasty to have its imperial capital located at the northern city
of Chang'an
B.It lasted for more than five hundred years until it was conquered by the forces of Attila
the Hun.
C.It dismantled large portions of the Great Wall to obtain building materials for a network
of canals.
DIt's first ruler was Wendi, who unified northern China and seized control of western
regions

Help please