Which of the Following Are True of Class I Major

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