The correct option is A):A numbering system based on 20.
The Aztecs were a tribe which ruled Mexico since the 13th century and culminated their power in 1521 when Spanish colonizers occupy the capital city,Tenochtitlan.
Scientific studies proved that the Aztecs had developed an innovative number system,a vigesimal system.This means that the Aztecs use 20 as the base for their numbering system.
