The correct answer is "D".
The Aztec Empire was originated from an Alliance between 3 city-states: Mexico Tenochtitlan (the Capital), Texcoco and Tlacopan. In Aztec culture, the nobility was considered as the ruling group of society and oversaw all matters regarding the production and distribution of goods and public policy.
Whenever the empire was put in front of an eventual conflict. Representatives from these 3 states gathered upon and, after receiving advice from counselors, would deliberate and eventually take the decision of engaging into war with neighboring communities.