U$3$C The formation of the membrane attack complex is a mechanism of the complement system that perforates microbial membranes. In what other way does the complement system contribute to the immune response?

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a It triggers antibodies to bind to antigens to neutralize them.

b It releases cytokines, which regulate transcripton of immune response genes.

c

It promotes phagocytosis of micorbial pathogens by coating microbes with antibodies or complement proteins, such as $C3b,$ marking them for destruction.

d It promotes the making of blood cells within bone marrow, forming lymphoid and myeloid lineages.