Final answer:
Phagocytosis is not a function of antibodies; it is the process carried out by phagocytic cells like macrophages. Antibodies facilitate this process through opsonization but do not perform phagocytosis themselves.
Therefore the correct answer is option is D) phagocytosis
Step-by-step explanation:
The function that is NOT a function of antibodies is D. phagocytosis. Although antibodies play a significant role in the immune response by marking pathogens for destruction, the actual process of engulfing and digesting these pathogens is carried out by phagocytic cells like macrophages and neutrophils, not by the antibodies themselves.
The functions that antibodies do perform include opsonization, where they coat pathogens to enhance phagocytosis, neutralization, where they block the infectivity of pathogens, and agglutination, where they cause pathogens to clump together. Together, antibodies contribute to the immune system's ability to identify and remove pathogens.