22. Which sentence best describes the primary vs. secondary antibody response to a viral antigen? (A) Primary response produces high-affinity IgG first; secondary response produces IgM only. (B) Primary response is rapid and strong because memory B cells activate immediately. (C) Primary response produces IgM first (lower affinity) and IgG later (higher affinity). (D) Primary and secondary responses are identical in timing and strength. (E) Secondary response is weaker because antibodies suppress memory B-cell activation.