45. B cells have antigen receptors that bind to antigens that are either freely dissolved or present on the surface of invading/foreign cells. T cells have antigen receptors that
(A) bind only to antigens present on the surface of the invading/foreign cells.
(B) bind to antigens that are either freely dissolved or present on the surface of invading/foreign cells.
(C) bind only to freely dissolved antigens in the plasma.
(D) are active only in lymph nodes.
(E) bind to antigen fragments presented on major histocompatability complexes by host cells.