6 is B
7 is D
8 is D
9 is B
10 is C
The civilizations you mention are not that early compared to most. But any civilization needs to have a secure food supply. So a geography that includes an area for good farming would be a necessity. Also, making sure the river you choose to live by is not going to dry up or freeze over every year. I hope that this is the answer that you were looking for and it has helped you.
The Christian Church was a major power in the Western Europe during the Middle Ages. The church was a powerful institution that ordered many facets of life during the Middle Ages. It gave legitimacy to political institutions and provided direction to the lives of the average people as well.
The countrys wanted to compete against each other for power/dominace