Which of the following innovations did the Romans contribute to architecture and engineering?

The Romans made significant contributions to architecture and engineering, most notably through their development of aqueducts and arch construction. Aqueducts were monumental in transporting water from distant sources into cities and towns, showcasing not only the Romans' engineering prowess but also their ability to support urban living. The use of arches in construction allowed for the creation of larger and more stable structures, facilitating the development of impressive buildings such as bridges, amphitheaters, and triumphal arches.

This innovation in arch construction provided strength and flexibility, enabling builders to span wider spaces than was previously possible with traditional post-and-lintel construction. The combination of these techniques helped the Romans construct enduring monuments and infrastructure that have influenced architectural design throughout history. The impact of Roman engineering is still seen today in many modern public works, illustrating the significance of their innovations in this field.