How Does the Drug Endari Reduce the Manifestations of Sickle

How does the drug Endari reduce the manifestations of sickle cell disease?

A) Promoting faster red blood cell production
B) Increasing the concentration of fetal hemoglobin (HbF)
C) Reducing oxidate stress and increasing the life span of red blood cells
D) Correcting the mutation of one allele so that the person has sickle cell trait instead of sickle cell disease