Your Friend Is Bitten on the Leg by an Aggressive

Your friend is bitten on the leg by an aggressive dog.Since the dog ran and was not caught,and since the dog bit many other people without reason,it is suspected that it had rabies.The city health department recommends the rabies vaccination for her,even though she has already been exposed to the infectious agent.Which statement best describes why the vaccine can be given post-exposure?

A) This particular strain of the rabies virus is probably nonpathogenic,so the vaccine is given to simply boost the immune system's own protective functions.
B) Since there is really nothing else to do,they suggest the vaccine as a last possibility.
C) The virus exhibits a long incubation period,in many cases providing the vaccine adequate time to have a protective effect in the patient.
D) There were few virus particles in the bite,so her immune system has enough time to kick into high gear.