Final answer:
The correct statement about antibody-mediated immunity is that plasma cells produce antibodies. Plasma B cells differentiate into plasma cells to secrete antibodies, crucial for humoral immunity, while T cells contribute to the immune response but do not produce antibodies themselves.
Step-by-step explanation:
The statement regarding antibody-mediated immunity that is correct is: A) Plasma cells produce antibodies. Plasma B cells differentiate into plasma cells and then produce large quantities of antibodies. These antibodies are integral components of the humoral immune response, which target pathogens in the extracellular fluid. After exposure to an antigen, memory B cells are generated. They persist in the body to mount a more effective response upon subsequent exposures to the same pathogen.
T cells and natural killer cells play a various role in the immune response by secreting cytokines and other substances that aid the immune response, but they do not produce antibodies themselves. The production of antibodies is a unique capability of B cells, making them central to humoral immunity. Cell-mediated immunity, on the other hand, is carried out by T cells that target infected cells directly.