Question: A vaccination is developed for a novel viral infection, and the antigen used corresponds to a short stretch of a protein found on the surface of the virus. In clinical trials, people who were exposed to the virus a second time had superior immunity compared to people who were given the vaccine and then exposed to the virus for the first time. What is the BEST explanation for this difference? Need Assignment Help? Question options: The vaccination promoted the production of all memory B cells, whereas natural infection promoted the proliferation of only those memory B cells specific to the virus. The vaccination promoted the production of the correct memory B cells, whereas natural infection did not. People exposed to the virus were able to make many different antibodies that bind different antigens on the virus. Vaccinations promote selection of memory B cells, whereas a natural infection triggers production of cytotoxic B cells.