Why does sickle cell anemia remain more prevalent in Sub-Saharan Africa than in the rest of the world? Select one: a. People of African ancestry are genetically predisposed to carry

Why does sickle cell anemia remain more prevalent in Sub-Saharan Africa than in the rest of the world? Select one: a. People of African ancestry are genetically predisposed to carry the sickle cell allele. b. The prevalence of malaria in Sub-Saharan Africa provided a selective advantage to individuals who were heterozygous. c. Reduced access to medical facilities predisposes Sub-Saharan Africans to an increased chance of disease. d. Infection with malaria provides a selective disadvantage to individuals who are heterozygous for the sickle cell allele.