b and after the building of the canals and the type of floods the rivers had, the crops were abundant, so c is the consequence and there was a surplus of food. Not everybody needed to work in the fields. Some devoted to other jobs like soldiers, rulers, etc. And so they went to live in cities or villages. But in order to distribute the products a strong ruler (it could be called king, priests, army so the state was born) was necessary. .
This is the actual correct answer. The person above me was super helpful, but instead of it being only b. and c. its actually b., c., and d.. Once again answer above me very helful but its b. c. and d.. Thank You very much and PLS BRAINLIEST :)
