Activation of Naïve B Cells Is a Two-Step Process, During

Activation of naïve B cells is a two-step process, during which

A) antigen triggers B-cell production of CCR7, which leads it to interact with T cells.
B) antigen triggers T-cell production of CCR7, which recruits B cells.
C) T-cell help stimulates B cells to produce CCR7, then divide.
D) macrophages trigger B-cell production of CCR7, which leads it to interact with T cells.
E) None of the answers are correct.