Who carved monuments called stelae?
a. aztec
b. maya
c. inca

The B. Mayans carved monuments called stelae. Stelae's were built as stone banners, raised to glorify the king, and record all of his deeds. It is said that the stelae is associated with divine kingship.

Ifound the exercise on the internet. attached is the list mentioned above.in order for a compound to be considered optically active it can't have any axis or plan of symmetry. the molecule  shouldn't also  be superimposable on its mirror image.with such considerations, the compounds that are optically active are: -third compound on the first image is optically active; -second and third compound from the second image are optically actives.