Hlp me .
which statement accurately describes an accomplishment of emperor yangdi that bring the chinese together as one people?
a.
he brought a patchwork of small kingdoms under one rule by rebuilding the army.
b.
he spread buddhism throughout mongolia and southeast asia.
c.
he built a vast network of canals for trade and communication, known as the grand canal.
d.
he convinced marco polo to share the technology of western europe with all regions of china.