C. huge tunnels were built for sewer lines
Answer:
I was looking for the answer tooo
Explanation:
We go to the same school btw lololololol
As for the rivers, the colonists were aware you must have water to successfully maintain life whether it be human life or plant life, it is necessary. Also being close to water helped them in the workforce, like carrying out trade or fishing It was a "win win" for them.