(C) The $ABO$ blood grouping system is based on the presence or absence of two surface antigens,namely $A$ and $B$,on the surface of red blood cells $

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(C) The $ABO$ blood grouping system is based on the presence or absence of two surface antigens,namely $A$ and $B$,on the surface of red blood cells $(RBCs)$.These antigens determine the blood type of an individual.Therefore,the antigens of blood groups are found on the surface of $RBCs$.