What Initiates T Cell Activation

Multiple Choice

What initiates T cell activation?

A) T cell activation begins when a T cell is ingested by a macrophage.
B) T cell activation begins when the T cell differentiates into effector cells and memory cells.
C) T cell activation begins with a dendritic cell processing and displaying antigen fragments on its MHC molecules.
D) T cell activation begins with the interaction of the T cell with other molecules on the cells called co-stimulators.