China's relationship with the koreas during this time period was
a. one of political control
b. positive trade
c. spreading of buddhism
d. completely conquering the region
bed

The answer is B. positive trade

They made a checks and balance system to equal power within the branches. the "check" meant that one branch would watch one branch and "balance" them if they were too powerful. if you want more info on this, i would just google checks and balance system.