40Immune System DefencesMedium1 markWhich statement describes a response of T-lymphocytes when body cells are infected by viruses?AT-helper cells destroy the infected body cells by phagocytosis.BT-killer cells bind to antigens on the surface of infected body cells.CT-helper cells release cytotoxins that enter infected cells, resulting in cell death.DT-killer cells secrete antibodies that destroy the infected body cells.Grade answerGrading criteria