A Couple of Recent Movies Depict Terrifying Scenarios in Which

A couple of recent movies depict terrifying scenarios in which pathogenic bacteria or viruses kill most of the people they infect.Which statement best answers whether it is possible for such a scenario to occur in real life and explains why?

A) It is not possible, because modern medicine has developed vaccines that protect us from harmful pathogens.
B) It is not possible, because even if someone does become infected, the medical community has so much knowledge and capability that it can effectively suppress any pathogen.
C) It is not possible, because bacteria and viruses found today are much less dangerous than they were many years ago when they caused so many human deaths.
D) It is possible because the more pathogenic the microbe, the easier it is for that microbe to infect someone.
E) It is possible because bacteria and viruses have such short life spans and large populations, they can quickly evolve new and very harmful characteristics.