What was one of the key contributions of Roman architecture?

One of the key contributions of Roman architecture was the use of arches to create grand structures. The arch allowed the Romans to build larger and more stable buildings than their predecessors, enabling the development of monumental architecture such as aqueducts, bridges, and amphitheaters. This engineering innovation not only provided the strength required to support heavy loads but also facilitated the creation of expansive interior spaces, leading to impressive structures that could accommodate large populations and complex functions. The widespread use of arches played a significant role in advancing architectural techniques and influenced many subsequent styles in architecture throughout history. The other options, while related to different artistic or architectural elements, do not capture the architectural breakthrough represented by the arch in Roman construction.