If you suspect a deficiency of antibodies in a person, to which of the following would you look for confirmatory evidence?

The correct option is C Serum globulins
A test for Serum globulins is required to confirm a deficiency of antibodies in a person. It makes up $2to3\%$ of plasma proteins. The $\alpha$ and $\beta$ - globulins transport compounds in the body while $\gamma$ - globulins act as the antibody defense against antigen infection.