Which One of the Following Statements About Primary and Secondary

Which one of the following statements about primary and secondary antibody responses is NOT true?

A) Antibodies in primary responses generally have lower affinity for antigen than those produced in secondary responses.
B) Secondary responses reach peak levels more quickly than primary responses.
C) Primary responses require higher concentrations of antigen for initiation than secondary responses.
D) Primary responses occur to all types of antigens, but secondary responses mostly occur only to protein antigens.
E) Primary responses are characterized by IgG antibodies, whereas secondary responses are dominated by IgM antibodies.