Complement-Fixing Antibodies Are Those That Function By

Complement-fixing antibodies are those that function by:

A) attaching to the surface of pathogens and contributing to their destruction by the lytic action of complement.
B) binding to and blocking surface receptors for host cells.
C) attaching to the surface of pathogens and making the pathogens more amenable to ingestion by phagocytic cells.
D) attaching to the surface of pathogens and contributing to their destruction by chemotaxis.