What were the contributions of Niccolò Machiavelli and Baldassare Castiglione??

what are the choices?

after the roman empire, the catholic church began to unify by taking on many duties of a government.

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. 

i dont know the answer sorry but if i knew it i would of told you