Answer: C) A large number of Aztecs died from European diseases
Explanation: One of the most well known reasons for the Spanish victory was disease. Europe was home to infectious diseases, like smallpox and measles, to which the Europeans developed natural immunity to. Coming to the Americas, the Spanish brought these deadly diseases along and spread them among the Aztecs. These diseases highly devastated the Aztecs. Since the diseases were new to them, the natives neither knew how to cure the diseases nor had any natural immunity against them