What Role Did Disease Play in European Efforts to Colonize

What role did disease play in European efforts to colonize Africa?

A) As in Latin America, European diseases devastated the populations of Sub-Saharan Africa, facilitating European conquest.
B) Endemic tropical diseases in Sub-Saharan Africa killed many Europeans, and delayed their conquest of the region.
C) Initially, endemic tropical diseases in Sub-Saharan Africa killed many Europeans, but later, European diseases devastated the peoples of Sub-Saharan Africa.
D) Initially, European diseases devastated the peoples of Sub-Saharan Africa; later endemic tropical diseases in Sub-Saharan Africa killed many Europeans, but by then, European conquest was well underway.
E) Disease played no role.