Final answer:
Follicular Dendritic cells secrete BAFF, IL-15, IL-6, and 8D6, which support B cell proliferation and differentiation in the dark zones of germinal centers.
Step-by-step explanation:
Follicular Dendritic cells (FDCs) are integral to the function of the germinal center, particularly in the dark zone where B cells proliferate and differentiate. The correct answer to what Follicular Dendritic cells secrete to help B cells proliferate and differentiate in the dark zones is c. BAFF, IL-15, IL-6, and 8D6.
These molecules play crucial roles in the survival and maturation of B cells during the immune response. Specifically, BAFF (B cell activating factor) and interleukins such as IL-6 and IL-15 act as survival and proliferation signals for B cells, helping them to mature into antibody-producing plasma cells.