Answer:
The only Roman aqueduct still functioning today is the Aqua Virgo, known in Italian as Acqua Vergine
source
https://www.nationalgeographic.com/history/magazine/2016/11-12/roman-aqueducts-engineering-innovation/
They were assisted by Israel or the supreme
B is the answer to the question
I think the answer is C). Floor Consideration because the passage something about the floor being open. That's my reasoning. I f it is not the correct answer and you get the correct answer please let me know because i am taking a test with this question it and i don't know the answer. So, thank you and I hope I helped.