Regarding IgG, which one of the following statements is the most accurate?
A.The ability of IgG to fix complement resides on the constant region of the light chain.
B.It is the most important antigen receptor on the surface of neutrophils.
C.It is the only one of the five immunoglobulins that is transferred from mother to fetus in utero.
D.During the primary response, it is made in larger amounts than is IgM.
E. Each IgG molecule has one antigen-binding site.