Choose the best location for easy transportation: plains plateaus mountains oceans

Plains.

Explanation:

Their flat surfaces are easily cultivated and usually contain the most productive soil. Moreover, such areas of low relief present few obstacles to land transportation, and the rivers running across them are generally much easier to navigate than are those of rougher terrain.

a is the answer i believe.

the answer is:

c. islam and christianity

explanation:

islam and christianity are widely practiced in africa. islam is practiced due to its spread from the middle east into africa, and christianity is practiced due to the colonization of africa by the british empire.