Which of the Following Statements Accurately Describes How Memory B

Multiple Choice

Which of the following statements accurately describes how memory B cells become activated during the secondary immune response?

A) Memory B cells present antigen bound to MHC II and bind to TH cells.
B) Memory B cells respond to soluble IL-4 and IL-6 without direct contact with TH cells.
C) Memory B cells must bind IgM antibody on activated B cells.
D) Memory B cells use CD40 surface proteins to attach to CD40 ligands on TH cells.