The best answer to go with is b
Answer: Aqueducts
Explanation: They were first developed around 312 B.C., these engineering marvels used gravity to transport water along with the stone, lead and concrete pipelines and into city centers. Aqueducts liberated Roman cities from reliance on nearby water supplies and proved priceless in promoting public health and sanitation.
The mountain ranges on Southeast Asia's mainland shaped the history of the region because the mountains separated the mainland from the rest of Asia and isolated early societies. The correct option among all the options given in the question is option "A".
The Eagle, Globe, and Anchor—the most distinct of all Marine Corps marks—has a long and storied heritage as the emblem for the Marine Corps. It is the basis for the flag, the seal, the branch-of-service insignia, and many of the logos.
It is considered the first decade of the modern era because it made a big change move from farming cultures toward capitalism, industrialization, secularization, rationalization, and the nation-state.
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