The Roman engineering achievement that made large public structures possible was

A)
the development of concrete.

B)
the development of organized labor.

C)
the development of measuring devices.

D)
the development of advanced math concepts.

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Roman Concrete. Explanation:Roman Concrete (also called opus caementicium) was one of the most important engineering achievements from the Roman Empire. It was a material based on hydraulic-setting cement, which is what some modern cements (like Portland cement) are based on. There are still some differences that make this concrete special, mainly the fact that they incorporated volcanic ash to prevent cracks from spreading.

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The fact that farmers were paid for destroying crops.