Which Statement Best Describes the Relationship Between an Antibody and an Antigen

Which statement best describes the relationship between an antibody and an antigen?

A) An antibody is specifically produced in response to an antigen.
B) An antibody is produced by T cells and an antigen is a foreign protein.
C) An antigen is presented by antigen presenting cells to plasma cells, which produce antibodies.
D) An antigen is a disease-causing organism, and antibodies are produced by B cells.
E) An antibody generally induces antigen formation.