A student states, It seems like helper T cells do a lot more than just 'help' the cellular ...

A student states, It seems like helper T cells do a lot more than just 'help' the cellular immunity process. Which of the following responses listed below best conveys an aspect of the role of CD4+ helper T cells in immunity?
 
  A)
  Without helper T cells, no antigens would be presented.
  B)
  Helper T cells play a major role in stimulating and regulating the whole process.
  C)
  Without helper T cells, the wrong antibodies would end up being produced.
  D)
  Helper T cells are key to the hematopoiesis that produces all the components of the immune system.