What is a crack in the earth's crust?

7.03-1.70=5.33 and 6.80+5.09=11.89 and 5.5-3.01=2.49

i only have few minutes according to the map above, which shows religious cultural regions, what two religions are most commonly practiced in africa? a. christianity and buddhism b. buddhism and hinduism c. islam and christianity d. hinduism and islam