Final answer:
B lymphocytes are the WBCs involved in the formation of antibodies; other cells such as neutrophils and monocytes are phagocytic but do not produce antibodies.
Step-by-step explanation:
The white blood cells (WBCs) that are active in antibody formation are the B lymphocytes. These cells are types of lymphocytes which are a part of the adaptive immune response. B lymphocytes mature into plasma cells that are responsible for producing antibodies. Neutrophils, monocytes, eosinophils, and other cells like macrophages and natural killer cells do play a role in the immune system, but they are not directly responsible for the production of antibodies. For example, neutrophils and monocytes are phagocytic, providing an early line of defense by engulfing pathogens, while macrophages can also produce chemicals that promote inflammation.