A. Higher incidence of severe β-thalassemia compared to severe α-thalassemiacould be explained by difference in copy numbers of α and β genes.B. α-globin/β-globin ratio is an appropriate marker for screening of β-thalassemia.C. α-Hemoglobin has a higher affinity for β-hemoglobin than for AHSP.D. AHSP deleterious mutations are expected to mimic β-thalassemia phenotypewith respect to α- chain aggregation.