Even today, a century after Pasteur developed the first vaccine, rabies almost always kills its victims unless inoculated in the earliest stages of the disease.


A its victims unless inoculated
B its victims unless they are inoculated
C its victims unless inoculation is done
D the victims unless there is an inoculation
E the victims unless inoculated


[spoiler]OA IS B , my doubt is , why is "they' needed in option B[/spoiler]