Which of the following statements about GVHD is wrong?

A．Allogeneic HSCT with HLA matched donors has a low incidence of graft rejection
B．The rejection rate of SAA is higher than that of leukemia
C．Removal of lymphocytes from donor hematopoietic stem cells reduces graft rejection
D．The rejection rate of SAA transplantation was independent of multiple transfusions before transplantation
E．Cord blood HSCT has a low incidence of rejection