What do the cities of Chichén Itzá and Tenochtitlán reveal about the cultures that created them?

The cities of Chichen Itza and Tenochtitlan reveal that the civilization that founded them have advanced knowledge in architecture, mathematics, physics, chemistry and astronomy at the very least.

To create such proportional and seemless structures, civilization must have advanced mathematics in practice. And for those structures to stand not only the test of time but also the forces of nature requires specialized knowledge in both chemistry and physics. This leads to the conclusion that the people who planned the structures are not only priests or shamans but also engineers who like their modern counterparts are well versed in the sciences.

the answer would be:

b. race