Which is common to both the ancient Mayan and Aztec civilizations?

A. They both spoke Nahuatl.
B. Their civilizations peaked at the same time.
C. They both lived in Middle America.
D. They both defeated Spanish invaders.

C. They both lived in Middle America.

To find the correct answer, we'll need to examine each option and eliminate the ones that are not common to both the ancient Mayan and Aztec civilizations.

A. They both spoke Nahuatl: The Mayans spoke various Mayan languages, while the Aztecs spoke Nahuatl. So, this option is not correct.

B. Their civilizations peaked at the same time: The Mayan civilization reached its peak between 250 and 900 AD, while the Aztec civilization flourished between the 14th and 16th centuries AD. Therefore, their civilizations did not peak at the same time. This option is also not correct.

C. They both lived in Middle America: The ancient Mayan and Aztec civilizations both occupied regions within Middle America, specifically in what is now Mexico and parts of Central America. This option is correct.

D. They both defeated Spanish invaders: The Mayan civilization declined and the Spanish conquistadors arrived in the region long after the Mayans had already experienced their collapse. The Aztecs, however, were eventually defeated by Spanish invaders. Therefore, only the Aztecs can be linked to this statement. This option is not correct for both civilizations.

Based on this analysis, the only option that is common to both the ancient Mayan and Aztec civilizations is:

C. They both lived in Middle America.

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