If You Transfuse Type AB Blood into a Patient with Type

Multiple Choice

If you transfuse type AB blood into a patient with type A blood,the patient will raise antibodies against the B antigen on the donor's blood,but will not raise antibodies against the A antigen.Why not?

A) B and T cells that recognize the A antigen will have been removed by clonal deletion.
B) Antibodies that recognize the A antigen will have been removed by the spleen.
C) Antibodies that recognize the A antigen will have been removed by the bone marrow.
D) Macrophages will not present the A antigen to T cells.
E) Recombination of the gene for antibodies cannot produce self-reactive clones.