The first is the best option.
It is true that a lot of cultural aspects of Africa have been lost, most specifically, religion.
If we look at imperialism, its height came after the main period of African slave trade (second answer is false).
The tribal conflicts are still very ripe in Africa, and often they're fueled by the carefulness boundary drawing of countries in Africa- the third answer is false.
More self-rule is also false, if anything, imperialism brought less self-rule
“Nathanael Greene in The American Revolution. Nathanael Greene (1742–1786) was a general in the American Revolution who also served in the Rhode Island assembly. He fought with George Washington at the battles of Trenton, Brandywine, Germantown, and Valley Forge”. -shmoop.com
Pull factor means a factor that attracts someone towards something, so the answer would be these 3 options:
Political tolerance of religious minorities
Abundant and cheap land
Abundant factory work
So you have information ready.
The "China Wall " is approximately twenty-three hundred years of age. (2,300)
