The rise of the Incan empire rested not only on the Incas' military might and the ability of their rulers but also they imposed a highly organized economic and political system on many different ethnic groups and permitting them to retain many of their customs and often their own leaders.
(A) they imposed a highly organized economic and political system on many different ethnic groups and permitting them (B) on their imposition of a highly organized economic and political system on many different ethnic groups, who were permitted (C) because of their imposition of a highly organized economic and political system on many different ethnic groups, who they permitted (D) on their imposing of a highly organized economic and political system on many different ethnic groups and they permitted them (E) imposing a highly organized economic and political system on many different ethnic groups, permitting them |