Which characteristics of adaptive immunity is responsible for disruption of the patient's normal immune function from chemotherapy?

Which characteristics of adaptive immunity is responsible for disruption of the patient's normal immune function from chemotherapy?

A. Epitomes on antigens are recognized by immunoglobulin receptors following presentation by accessory cells

B. Happens combine to form epitomes that stimulate the response of regulatory and effector cells

C. Effector cells orchestrate the immune response of regulatory cells towards an antigen

D. Accessory cell such as macrophages are engulfed by regulatory cells, stimulating effector cells