What is needed to create a successful civilization. Include understanding of both physical and human geography.

1. Large population centers; 2. monumental architecture and unique art styles; 3. shared communication strategies; 4. systems for administering territories; 5. a complex division of labor; 6. the division of  people into social and economic classes

Explanation:

B: The region experienced a surplus of food. - the best answer. Nile Valley was located near river Nile in Egypt. It was a flood plain defined like a heaven for farmers. There were perfect conditions for people to grow food and obtain water. The river was flooding created conditions to live like that.