B Cells Have Been Shown to Need Two Signals for Activation.Absent

B cells have been shown to need two signals for activation.Absent T-cell help, they will NOT activate because

A) T cells provide signal 1 through the B-cell receptor.
B) T cells provide signal 2 through the B-cell receptor.
C) T cells activate B cells indirectly by activating follicular dendritic cells.
D) T cells activate B cells through CD40 signaling.
E) B cells will still activate because of dendritic cells.