How were the aztec and inca civilizations different from american indian civilizations in north america before contact with european explorers

The correct answer is A) they were larger and more political intricate.

The Aztec and Inca civilizations different from American Indian civilizations in North America before contact with European explorers in that they were larger and more political intricate.

The Aztecs were one of the most important cultures in Mesoamerica. They inhabited the actual territory of downtown Mexico City and close towns. They were warriors that conquered other tribes and made them pay tribute. The Incas were the most important prehispanic culture in South America. They inhabited the territories of Peru, and built the impressive city of Machu Pichu, at the top of the Andes Mountains. Both cultures had large populations -to the contrary of American Indian civilizations in North America- and also had complicated political and social structures in their respective societies.

The other options of the question were B) They established a religion featuring rituals and spiritual leaders. C) They fought more frequent wars with neighboring communities. D) They developed sophisticated agricultural techniques.  

b is the answer i am assuming