Which was NOT a factor in the development of cities in Mesopotamia? A) Plentiful food supplies made it easier for trade and new jobs. B) Silt left behind by floods made the soil fertile and could grow

Which was NOT a factor in the development of cities in Mesopotamia? A) Plentiful food supplies made it easier for trade and new jobs. B) Silt left behind by floods made the soil fertile and could grow more food. C) Many natural barriers- such as mountains- led to less warfare in the region. D) The development of irrigation systems allowed water into drier areas and helped the population grow.