Here are the best responses to each of the questions based on historical context regarding the Aztec Empire:
Question 1: A) The Mexica started the Triple Alliance with two other groups in order to fight an oppressive kingdom in the Valley of Mexico.
Question 2: A) Although it began in the Valley of Mexico, the Aztec Empire expanded to include territories as far south as modern Guatemala.
Question 3: A) The Aztecs used chinampas to reclaim farmland from lake or marshlands and create plots of land that could be easily irrigated by surrounding water.
Question 4: A) These allowed them to collect rain, runoff, and flood waters to irrigate their crops when needed.
Question 5: A) It was led by an emperor who represented a god, and each city-state within the empire had local rulers.
If you have any further questions or need additional context, feel free to ask!