Only 5% of Kell-Negative Individuals Will Develop Antibodies to Kell

Multiple Choice

Only 5% of Kell-negative individuals will develop antibodies to Kell if exposed to the Kell antigen, whereas 50% to 70% of Rh(D) -negative individuals would produce antibodies to D upon exposure. What is the reason for this?

A) Difference in ABO type
B) Difference in immunogenicity
C) Phenotype
D) All of the above