It was lighter and easier to use than stone. The correct option is C.
Why did Romans use concrete over stone?
Romans were fortunate. Roman concrete's composition makes it incredibly durable. Nowadays, "Portland cement" is generally used to create concrete, which is then combined with water and aggregate (like gravel). Concrete made with Portland cement does decay over time. Inserting steel reinforcing rods into it is a frequent method of trying to make it stronger.
Its "tensile" strength is significantly increased as a result, much above what Roman concrete was capable of. For instance, a motorway overpass span, which is frequently utilized nowadays, could never be constructed using Roman concrete.
Steel rusts, which is a significant downside of steel reinforcement. This causes cracks and other weaknesses in the concrete in addition to weakening the substance. It was lighter and easier to use than stone.
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