Which Statement Below Characterizes the Complement System

Which statement below characterizes the complement system?

A) Complement comprises a team of blood proteins that are activated in a cascade,ultimately leading to pathogen cytolysis,inflammation and enhanced phagocytosis.
B) Complement pyrogens stimulate the hypothalamus to raise the body temperature,increasing metabolism and preventing the growth of temperature-sensitive pathogens.
C) Complement proteins bind to cell surfaces and induce changes in genetic expression,eliminating not only pathogens,but cancer cells also.
D) Complement proteins,produced by a host cell in response to viral attack,are secreted and enter neighboring cells,stimulating the production of antiviral proteins in anticipation of an invasion.