All of the Following Are True of the Primary Response

Multiple Choice

All of the following are true of the primary response to antigen exposure except that

A) it depends on antigen triggering the appropriate B cell.
B) it requires B cell differentiation into plasma cells.
C) it is delayed by the memory cell stage.
D) circulating antibodies undergo a gradual,sustained rise.
E) it peaks 1 to 2 weeks after the initial exposure.