What Typically Prompts a Naïve B Cell to Develop into a Plasma

What typically prompts a naïve B cell to develop into a plasma cell that secretes antibodies?

A) A T-helper cell with the same specificity binds to the antigen.
B) A cytotoxic T cell interacts with the B cell.
C) Chemical signals are sent from memory cells.
D) Chemical signals are sent from other plasma cells with the same specificity.
E) Adjacent B cells secrete stimulatory antibodies.