Helper T Cells and Regulatory T Cells ________

Multiple Choice

Helper T cells and regulatory T cells ________.

A) include approximately 10-15 percent of the circulating lymphocytes
B) can differentiate into plasmocytes when appropriately stimulated
C) are solely responsible for the phenomenon in the body known as "humoral immunity"
D) control the activation and activity of B cells
E) are responsible for the production and secretion of antibodies