Genetic mutations introduce new gene forms in a population. For instance, the mutation that affects hemoglobin alters the shape of the red blood cell and makes it sickle-shaped. Which statement
below would explain why the sickle-cell mutation has spread through the gene pool?

A. There is a selective advantage to having Sickle Cell Anemia.

B. This kind of mutation demonstrates a common ancestor.

C. The sickle cell mutation has no benefit.

D. Sickle cell anemia increases the risk of death.