Which of the Following Describes the Primary Role of Th1

Which of the following describes the primary role of Th1 cells in modulating the immune response?

A) They present foreign antigens to B and T cells.
B) They engulf virus particles and present peptides on MHC-II.
C) They release cytokines that stimulate differentiation of cytotoxic T cells.
D) They release cytokines that stimulate a B cell to differentiate into a plasma cell.
E) They recognize and kill virus infected cells.