The correct answer is A. Rome
Explanation:
Concrete is a common construction material composed of aggregate such as gravel that hardens over time creating long-lasting structures. This material dates back to the Classical era; one civilization that was known for the use of concrete during this period were the Romans. Indeed, the Romans created their own version of concrete by incorporating volcanic ash and they used this material to construct many structures including the Colosseum. The use of concrete was important during the Roman Empire because it allowed Romans to create almost any structure without the limitations of other materials such as bricks. Therefore, concrete was an important material in the architecture of Rome.
