How Can You Be a "Carrier" of Sickle Cell Disease

How can you be a "carrier" of sickle cell disease?

A) If you are infected by someone who has sickle cell disease, but your immune system mostly fights it off, you will be a carrier.
B) If you inherit the hemoglobin HbS allele from both your parents, you will be a carrier.
C) If you inherit the hemoglobin HbS allele from one of your parents, you will be a carrier.
D) If you come into contact with someone with sickle cell disease but you are not actually infected, you will be a carrier.
E) If you inherit the hemoglobin HbA from both your parents, you will be a carrier.