Answer:
d. the Sahara desert forms a cultural barrier in Africa
Step-by-step explanation:
The vast dune and ocean of sands that forms the prominent Sahara desert serves a big cultural barrier on the African continent.
Geographically, South of the Sahara lies huge expanse of tropical rainforest and the Atlantic. Going northward we see Mediterranean climate.
Culture is the way people live. The Sahara is home to diverse cultures. The Magrebs, Bendouins, Arabs are some of the dominant tribes. These cultures are very uinque in that the people are mostly nomads. They carry their animals about looking for pastures and water.
To the South lies the Yoruba, Ashanti etc. These cultures are rooted in farming as a means of food production.
Their cultures a quite distinct from the northern nomads.
Going from North to South we see distinct cultures and people.