What is a notable feature of classic urban planning in the acropolis?

In classic urban planning, particularly in the context of the acropolis, a significant characteristic is the emphasis on religious and defense functions without a stringent, predefined layout. The acropolis often served as a fortified high point in ancient cities, primarily designed to host temples and significant structures, reflecting the culture and values of that society.

Unlike other urban planning approaches that prioritize a geometric or organized street layout, the acropolis was shaped more by the natural terrain and the functional requirements of the structures it contained. This resulted in a more organic integration with the landscape, emphasizing the sacred and strategic importance of the site rather than adhering to strict planning principles. The acropolis illustrates how urban design can evolve around prominent geographic features while supporting the social, religious, and defensive needs of the civilization.

Other options suggest more structured approaches to urban planning that do not capture the essence of the acropolis's unique combination of purpose and layout.