Answer:
A) militarily conquering other tribes and making alliances.
Step-by-step explanation:
One of the reasons the Aztec empire achieved such a high level of wealth, development and stability is due to their alliances and conquest of other native groups. The Aztecs dominated the whole of the valley and exerted their power over dominions such as Texcoco, Tezozomoc, Azcapotzalco and Tlaxcala, which were also forced to pay a tribute to the Aztec Empire.