What was the relationship between rivers and government in early cities? A. Rivers made governing early cities more difficult because they allowed for easy access by intruders and foreign influences. B. Rivers slowed the development of government and cities because early civilizations were based primarily on agriculture, which required a rural area. C. Rivers hastened the need for government development because agriculture was becoming so successful; widespread agriculture and trade required a system of taxes and trade rules. D. Rivers allowed territorial rulers to travel more quickly to handle rebellion or defend against threats; they also became bases for military operation and command to rule territory effectively.