Although Our Understanding of the Kinetics of T-Cell Activation Has

Although our understanding of the kinetics of T-cell activation has changed over time, we now believe that

A) antigen availability does not affect T-cell/APC interactions.
B) antigen quantity does not affect T-cell/APC interactions.
C) optimal proliferation of helper T cells requires only relatively brief APC exposure.
D) optimal proliferation of helper T cells requires several hours of APC exposure.
E) dendritic cell activation does not affect T-cell activation.