Which of the following statements is false?

Which of the following statements is false?
  a. Only B cells and their progeny make antibodies.
  b. The primary immune response is faster and more
  complete than a secondary immune response.
  c. Naive B cells already have antibodies but have
  not yet encountered an antigen.
  d. Macrophages will digest invading bacterial cells
  but do not destroy the antigens that eventually
  become mounted on their surfaces.
  e. B cell progeny may differentiate into memory
  cells.
 
 

Question 2

Which of the following is (are) false regarding B
  cells with antigen-MHC complexes?
  a. They are stimulated by helper T cells to secrete
  cytokines.
  b. Helper T cells signal them to divide and
  differentiate.
  c. On signals from the helper T cells, they produce
  clones with identical receptors.
  d. Once activated by signals from helper T cells,
  they produce IgG, IgA, or IgE immunoglobulins
  instead of membrane-bound IgM.
  e. All of these are true.