The Sickle-Cell Allele Is Maintained in African Populations Even Though

The sickle-cell allele is maintained in African populations even though when two sickle-cell alleles are inherited it can be fatal because

A) having two sickle-cell alleles makes the person immune to malariA.
B) having two non-sickle-cell alleles makes a person immune to malaria.
C) having a non-sickle-cell allele and a sickle-cell allele makes the person resistant to malaria.
D) having a non-sickle-cell allele and a sickle-cell allele makes the person more likely to be resistant to cystic fibrosis.
E) the sickle-cell allele is dominant.