Which of the Following Is a Difference Between B Cells

Which of the following is a difference between B cells and T cells?

A) One has a major role in antibody production, while the other has a major role in cytotoxicity.
B) One binds a receptor called BCR (B-cell receptor) , while the other recognizes a receptor called TCR (T-cell receptor) .
C) B cells are activated by free-floating antigens in the blood or lymph. T cells are activated by membrane-bound antigens.
D) T cells are produced in the thymus and B cells are produced in the bone marrow.
E) B cells produce histamine while T cells produce complement.