During the course of an intestinal infection with Salmonella enteritidis, the B cells undergo class switching. ________ switching is most likely to occur, which is caused by ________ cytokines.
A) IgD to IgE; B-cell B) IgM to IgA; T-cell C) IgG to IgM; B-cell D) IgA to IgG; T-cell E) IgD to IgM; T-cell