B cells have antigen receptors that bind to antigens that are ...

[futuristic]

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

[aero]

I remember it was D