The correct option is B Serum globulins
Antibody deficiencies, also called as immunoglobulin deficiency syndromes, are immune system disorders that are characterized by low or absent levels of immunoglobulin or serum globulin in the blood. The measurement of protein is done on serum, which is the fluid (globulins) that
remains after plasma has clotted, thus removing fibrinogen, hemocyte, albumin and most of
the clotting factors.
A serum albumin functions primarily as a carrier protein for steroids, fatty acids, and thyroid hormones in the blood.
Fibrinogen is the major plasma protein coagulation factor.
A haemocyte is a cell that plays a role in the immune system of invertebrates.