In Terms of the Integration of a Centralized Empire, How

In terms of the integration of a centralized empire, how did the Incas and Aztecs compare?

A) The Aztecs and Incas both made little attempt to integrate conquered territories and permitted self-rule in return for loyalty and tribute.
B) The Aztecs were more advanced than the Incas in consolidating their government into an integrated unit.
C) The Incas attempted to create an over-arching political state and made conscious attempts to integrate their empire as a unit, while the Aztecs did less in this regard.
D) Both the Incas and the Aztecs created fully integrated empires complete with central bureaucracies and military administrative units that controlled all conquered regions.