Today there are people who think that childhood diseases, like polio, are not a serious problem and are survivable if their children get them. They may even know someone whose child had a mild form of the disease. What is the BEST argument against the idea that polio is a mild disease? A. Some who get it will get very sick and others will not have long-term effects. B. There is now a vaccine for polio, so it is not really a problem in modern society. C. Very few people get polio today thanks to the success of polio vaccinations. D. Polio can cause paralysis and other life-altering consequences for decades after a child has the disease.