Roman engineering was under practice of extensive use of concrete, as an ideal construction material.
What is construction material?
Any material, which is used for the purpose of different types of structures like buildings or any such structures is known as a construction material.
The use of concrete as a construction material was popularized by the Roman architects during the period of Renaissance. It was sturdy and much more durable than any other material.
Hence, option A holds true regarding the construction material used by the Romans in their engineering projects.
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