Which of These Statements Does NOT Describe T Cells

Which of these statements does NOT describe T cells

A) When cytotoxic, they release chemicals that destroy targeted cells.
B) As helpers, they enhance the activity of other T cells and B cells.
C) As suppressors, they are believed to play an important role in tolerance to self-antigens.
D) As helpers, they can combine only with host cells bearing both foreign antigen and class I, MHC-encoded self-antigens on their surface.