It was the coincidence of the geographic range of the sickle cell gene and malaria that first drew attention to the possibility that the sickle cell gene might confer resistance to the disease.
(A)
(B) It was the geographic range of the sickle cell gene coinciding with malaria that
(C) The geographic range of the sickle cell gene coinciding with malaria was what
(D) The geographic ranges of the sickle cell gene and malaria coinciding was what
(E) It was that the geographic ranges of the sickle cell gene and malaria were coincident that
I think D. urs?
OA -> missing
(A)
(B) It was the geographic range of the sickle cell gene coinciding with malaria that
(C) The geographic range of the sickle cell gene coinciding with malaria was what
(D) The geographic ranges of the sickle cell gene and malaria coinciding was what
(E) It was that the geographic ranges of the sickle cell gene and malaria were coincident that
I think D. urs?
OA -> missing

















