Which of the Following Statements About the Hb^S Allele Is

Which of the following statements about the Hb^S allele is NOT true?

A) It is found in higher gene frequencies in regions where malaria is endemic.
B) It causes sickle-cell anemia in homozygous individuals.
C) It spread through the tropics as communities adopted slash-and-burn agriculture.
D) Heterozygous individuals have an increased immunity to malaria.
E) Homozygous individuals usually develop fatal cases of dysentery.