When a "new" antigen first challenges the immune system, if the primary immune response produces B cells, what are the fates of those B cells?

I-Some of the B cells become plasma cells that secrete antibodies.
II-Some of the B cells become memory cells and can produce a swifter response if the body encounters that particular antigen again.
III-Some of the B cells secrete chemicals called pyrogens that travel to the brain inducing a fever. 
A. just II
B. just I
C. II and III
D. I and II
E. I, II, and III


D. I and II

Biology & Microbiology

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