Explanation:

Antibodies, also known as immunoglobulins, are Y-shaped proteins produced by the immune system to identify and neutralize foreign objects like bacteria and viruses. They are primarily produced by specialized white blood cells. Option (C) is correct because lymphocytes, specifically B lymphocytes (B cells), are the immune cells responsible for producing and secreting antibodies. When a B cell encounters its specific antigen, it differentiates into plasma cells, which are prolific antibody producers. Option (A) is incorrect; Platelets are cell fragments involved in blood clotting and do not produce antibodies. Option (B) is incorrect; Red Blood Cells (RBCs) are primarily involved in oxygen transport and do not produce antibodies. Option (D) is incorrect; Eosinophils are a type of white blood cell involved in allergic reactions and fighting parasitic infections, but they do not produce antibodies.