To Activate the Cell-Mediated Immune Response, Which Event Must Occur

Multiple Choice

To activate the cell-mediated immune response, which event must occur?

A) A naïve helper T cell must bind to an antigen-presenting dendritic cell.
B) A naïve B cell must be activated in order to activate the effector helper T cell.
C) A free bacterium must pass through a lymph node where it will directly activate the effector helper T cell.
D) A damaged or infected body cell must pass through a lymph node in order to activate T cells.
E) Antibodies must bind to naïve helper T cells.