The response represented by the dashed line in the accompanying figure indicates a:

The response represented by the dashed line in the accompanying figure indicates a:
  a. secondary response to the initial antigen.
  b. primary response to the initial antigen.
  c. secondary response to an antigen distinctly different from the initial antigen.
  d. primary response to an antigen distinctly different from the initial antigen.
  e. secondary response equivalent to a primary response

Question 2

The immune system component with a principal role at point B in the accompanying figure is:
  a. memory cells.
  b. IgM antibodies.
  c. IgG antibodies.
  d. cytotoxic T cells.
  e. antibody IgA.