Which Statement Best Describes the Difference in Responses of Effector

Which statement best describes the difference in responses of effector B cells (plasma cells) and cytotoxic T cells?

A) B cells confer active immunity;cytotoxic T cells confer passive immunity.
B) B cells respond the first time a pathogen is present;cytotoxic T cells respond subsequent times.
C) B cells secrete antibodies against a pathogen;cytotoxic T cells kill pathogen-infected host cells.
D) B cells carry out the cell-mediated response;cytotoxic T cells carry out the humoral response.