The accurate statement about the Aztecs and the Spanish is:
The Aztecs had a complex civilization that was destroyed by the Spanish conquerors.
This statement reflects the historical reality that the Aztec Empire had a sophisticated societal structure, including advanced agriculture, architecture, and governance, which was ultimately conquered by Spanish forces led by Hernán Cortés in the early 16th century. The other statements are not accurate representations of the relationship between the Aztecs and the Spanish.