Part a: which statement best expresses the central idea of the text? a vaccines can be a dangerous way to protect the body from diseases, as you have to initially expose the body to disease. b vaccines are not necessary to protect against diseases, as the body will automatically remember certain diseases and protect against them. c the immune system struggles to remember viruses that it has experienced and needs the of vaccines to make memories of them. d a vaccine is developed by familiarizing your body with a pathogen so that it can recognize it and keep it from spreading within you and to others.