The answer to your question is A, most likely.
A cataract is an area of a river where the elevation of the streambed changes too quickly or has to many boulders meaning people couldn't use part of the river as transportation.
This was a good thing because the cataracts effectively served as barriers so they could control travel. This meant that the Pharos found it impossible to control the land south of the first cataract. This ending up becoming the southern border of Ancient Egypt.
Hope this helped ☺️
There are many people in urban areas. If there are floods, it could kill a lot of people. Also, floods sometimes damage buildings. If the buildings collapse, it would cause a big problem.
Ancient Egypt was concentrated on the Nile River.
I do not think so. what other technology could we use.
