Is that the full question?
They left rich soil when flood waters receded. So the correct option for the given question is option "d". It has been seen that rivers carry with them very rich and fertile soil which the farmers prefer because the amount of crop and the quality of crop is much better than they can get in any other place. The civilization of ancient Egypt as well as the Indus valley civilization were totally dependent on the Tigris and the Indus river respectively, as far as irrigation was concerned. Seasonal flooding always brings with it new fertile soil for irrigation.
Answer:
The Japanese attack on Pearl Harbor
Causes: differences in religious belief. The Puritans believed that the Church of England needed to be purified by elimi- nating all traces of Catholicism. ... Hutchinson taught that believers needed neither the church nor its minis- ters to interpret the Bible. Results: Hutchinson was ban- ished from Massachusetts Bay
