After activation of C3 of the complement system,which of these is a role of its component part, C3b? 

A)It acts as an enzyme to convert nitric oxide into hydrogen peroxide.
B)It causes vasodilation of local blood vessels.
C)It acts as a chemotaxin for macrophages.
D)It stimulates the conversion of monocytes to neutrophils.
E)It acts as an opsonin that is recognized by phagocytes targeting the microbe for destruction.