Which group used pyramids to study astronomy?

A) Aztecs

B) Incas

C) Mayas

C) Mayas

Explanation:

The Mayas were, among the three greatest pre-columbian American civilizations (the ones listed in the question), the one that had the most important and accurate astronomy knowledge, a knowledge that surprises even contemporary astronomers. This was in part due to their use of pyramids to study astronomy, and to develop calendars.

The Incas on the other hand, did not really build pyramids, and the Aztecs built impressive pyramids but mostly for other purposes.

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