In Desensitization Immunotherapy, an Antigen Is Used to Stimulate Cell

In desensitization immunotherapy, an antigen is used to stimulate cell 2, which can then stimulate cell 3 and cause the production of item 4. Identify cell 2, cell 3 and item 4.

A) T helper 1 cell, T helper 2 cell, and IgG antibodies
B) mast cell, T helper 2 cell, and IgE antibodies
C) T regulatory cell, T helper 2 cell, and IgE antibodies
D) T regulatory cell, T helper 1 cell, and IgG antibodies
E) T regulatory cell, mast cell, and IgD antibodies