How does the term “The White Man’s Grave” explain why much of Africa went unexplored by Europeans for so long? Select one:
a. This term refers to the dangers Europeans faced in Africa's interior due to disease, wild animals, and hostile tribes.
b. This term refers to the massacre of European missionaries who tried to bring Christianity to tribal Africans
c. This term refers to incidents when native Africans killed white Europeans, who were seen as white devils.
d. This term refers to the vast number of European slave hunters who were slaughtered and placed in mass graves.