<span>Three major achievements of the Mayan civilization were in architecture, astronomy and math. The Maya people were great builders who constructed roads, great cities and temples. Mayan cities had magnificent palaces, monuments with intricate designs and temple pyramids that are still evident today.</span><span>
</span>
I assume it is the D, the river. The other answers don't make any sense and the river would 'reflect' the hues of the sky.
Because classical is peaceful. It was beauty to anyone, not just the wealthy...