Answer:
a. Aztec history, like all history, has a darker side. Humans aren't perfect.
Explanation:
According to the given excerpt, the author talks about people not expecting a smoothly ironed history because there will always be the good and bad sides of history, some beauty and some ugliness.
The author means that Aztec history, like all history, has a darker side, and humans aren't perfect, when he states that we should not expect a "smoothly
ironed" Aztec history.
