Why Is Sickle Cell Disease More Common Among African Americans

Why is sickle cell disease more common among African Americans than Whites?

A) Because the ancestors of many African Americans were from parts of Africa where malaria is common
B) Because Black people are genetically predisposed to the disease
C) Because sickle cell disease is found only in Africa and is found in every part of the continent
D) Because White children have higher rates of vaccination against the disease