What is the role of antibodies within the immune system?

Antibodies play a crucial role in the immune system, primarily by neutralizing foreign objects such as bacteria, viruses, and toxins. They are specialized proteins produced by B cells, a type of white blood cell. When an antibody encounters an antigen, which is a substance that the body recognizes as foreign, it binds to that antigen. This binding can neutralize the pathogen directly by blocking its ability to enter or damage cells, or it can mark the pathogen for destruction by other immune cells. This process enhances the body's ability to eliminate potentially harmful invaders.

Other choices imply functions that are not associated with antibodies. For example, antibodies do not stimulate viral infections; instead, they serve to combat them. They also do not produce hormones; that function is typically associated with glands within the endocrine system. While communication between immune cells is essential, this is primarily facilitated by signaling molecules called cytokines rather than antibodies. Therefore, the role of antibodies within the immune system is specifically focused on identifying and neutralizing foreign entities, making option B the accurate choice.