Final answer:
Opsonins are not classified as cytokines, but rather as molecules that aid in phagocytosis. Interferons, interleukins, and tumor necrosis factor (TNF) are examples of cytokines involved in innate immunity.
Step-by-step explanation:
The correct answer is B, opsonins. Opsonins are not classified as cytokines, but rather as molecules that aid in phagocytosis by marking pathogens for destruction. Cytokines, on the other hand, are small protein molecules that are involved in cell signaling and communication during the immune response. Examples of cytokines involved in innate immunity include interferons, interleukins, and tumor necrosis factor (TNF).