How did geographic conditions limit contact between africans and people from outside of the middle east?

Sahara desert was a large isolating buffer that prevents eastern and sub-saharan African peoples from consistent contact with other peoples. The middle east was the only civilzation with land connection to the rest of Africa an stood in between Africans and the rest of the known world.

i think the answer would happen to be the letter b

because the bar never runs out

couples always argue

the urdan working class