The most accurate comparison of the role of monumental architecture in the Aztec and Inca Empires from the provided options is:
The Aztec and the Inca Empires' monumental architecture both had two temples that signified religion; the Aztec worshipped two gods, whereas the Inca worshipped one god.
This option correctly acknowledges the religious significance of monumental architecture in both cultures and highlights a key difference in their religious practices.