Small pox was a huge problem during the pre revolutionary war erra but was not successfully araticated until the late 70s, it was wiped out because people where vacinated at a very young age. so the answer is B The smallpox vaccine was given for a long time and the disease no longer exists.
The answer is a because the rest just don’t make sense with this question
It is B I hope so tehdhudbebehshsjjsjs
