Answer:
My choice is: the harsh desert climate required cooperation
Explanation:
If you don't know, the Bedouin people lived in a very hostile environment. They were also nomadic as well. Therefore, we can cross off A since they didn't have abudant resources in the area. The third one doesn't work because they are nomads, not city dwellers (who would have been established in one areas). The last one doesn't work since the second one is true.
The second one is true because they developed strong ties from their cooperation. Safety was one of their biggest concerns, and living alone was bad since they couldn't live by themselves. By having close clan relationships, they had a better chance of survival in the dangerous environment.
