Answer:
The answer is C. Cortés leveraged the discontentment felt by the tributary city-states of the Aztec Empire, like the Tlaxcaltecas and the Texcocans, and allied his army with theirs
Explanation: Hernan Cortes was able to conquer the Aztec Empire by scaring the natives with the 16 horses, gaining alliances with the other enemies of the Aztec, having superior and better weapons than the natives (like guns), having armor, and having steel.