Individuals Who Have Had a Transplant Are Often Prescribed Immunosuppressant

Individuals who have had a transplant are often prescribed immunosuppressant medications. As a result, they often suffer from frequent infections and in some cases tumor formation. Why does this occur?

A) Immunosuppressants destroy mast cells in the tissues.
B) Immunosuppressants decrease recombination in stem B cells.
C) Immunosuppressants decrease T cell activity.
D) Immunosuppressants bind immunoglobulins.