Before Xerxes I invaded Greece, what did he first need to do?

The question above was all three answers but I'm taking test rn its B defeat revolts in Babylon and Egypt

Explanation:

i think the answer is a and i hope this ; ))

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.