Which statements describe aspects of the Inca's civilization?
(all that are correct)
A. Conquered people hated their new rulers and eventually helped defeat them
B. Its capitol city had a population larger than any European of the time
C. Knotted strings called khipu recorded numbers
D. Runners allowed villages and cities throughout the empire to communicate quickly with rulers far away
(I think it's C and D, but I'm not positive)