The Allele Hb^S That Codes for the Type of Hemoglobin

The allele Hb^S that codes for the type of hemoglobin associated with sickle-cell anemia

A) is distributed evenly throughout all human populations.
B) less susceptible to malaria.
C) is always lethal when found in a human population.
D) has no effect on the viability of a population.
E) is never expressed in the phenotype when present in a homozygous state.