Which of the following explains the impact of location on the settlement of early people? A. Civilizations were located in mountainous areas that were remote and immune to attack. B. Civilizations were located near other cities, which allowed groups to rely on each other to provide resources. C. Civilizations were located near rivers, which supported agriculture and provided natural resources and transportation. D. Civilizations were located in areas with natural defenses, which served as protection and removed the need to build walls.