All of the Following Are True of the Primary Response

Multiple Choice

All of the following are True of the primary response of humoral immunity, 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.