Answer:
B
Step-by-step explanation:
key word is early civilizations
B. Conflicts over water sources was one of the most common causes of wars between early civilizations.
Water was a crucial resource for agriculture, transportation, and sanitation, and civilizations often fought to control access to waterways or to secure reliable sources of freshwater for their populations. However, it is important to note that wars between early civilizations had multiple causes and were often complex, with factors such as trade, territory, ideology, and power also playing significant roles.