Explain the environment the supergroup formed in and what kind of rock makes up this supergroup? What had to happen to the rock?

can you attach the answer options

the right answer for the question that is being asked and shown above is that: "their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.  " the  participant in european imperialism is being described below is that  their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful. 

the answer should be a. the sui empire, the tang empire extended from korea in the west to manchuria in the east.