Which one of the following innovations enabled Romans to erect giant amphitheaters, public baths, and high-rise tenement buildings?

Question

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Concrete was a major innovation that allowed the Romans to build massive structures such as arenas, public baths, and high-rise buildings. It was durable, strong, and could be poured into molds to create complex shapes. The Romans used a type of concrete made from volcanic ash mixed with lime and water, which hardened over time and provided a sturdy foundation for many architectural marvels.

Which One of the Following Innovations Enabled Romans to Erect