The relevant sentence in the passage is: The Romans constructed numerous aqueducts throughout the Empire to bring water into cities and towns -- often from distant sources.is the reasoning for what question and answer pair?
Q: The Romans constructed numerous aqueducts throughout the Empire to bring water into cities and towns -- often from distant sources. The water supplied public baths, latrines, fountains, and private households. Aqueducts also provided water for mining operations, milling, farms, and gardens.

Based on this passage, what did the ancient romans build to maintain the supply of water in their cities?
A: aqueducts