Which Statement Best Describes How B Cells and T Cells

Which statement best describes how B cells and T cells work together to achieve humoral immunity?

A) The B cells and the T cells bind together and engulf pathogens.
B) The T cell activates the B cell to produce pathogen-fighting plasma.
C) The B cell activates the T cell to produce pathogen-fighting plasma.
D) Plasma cells activate the T cells to produce B cells.
E) Plasma cells activate the B cells to produce T cells.