Examine the Figure Below

Multiple Choice

Examine the figure below.

Which events have occurred previously to create the situation depicted with the bacterium shown in this figure?

A) The bacterium has successfully overcome the first two barriers of the host's immune response: its barriers and the adaptive response.
B) The presence of an antibody molecule indicates that the antigen has been contacted by a B cell,the B cell underwent cloning,and one of the cloned effector cells has begun antibody production.
C) A cytotoxic T cell recognized the bacterium's antigen and transferred the toxic complement protein directly onto its surface.
D) The bacterium has phagocytized a lymphocyte and is using the captured complement protein to mask itself from other immune cells.