This question has options. Select from options: Read this fact: "vaccines can help prevent illness"

Now answer this question: "Children are more likely to get smallpox if"

Available options: -their parents base their medical decisions on advice from has-been adult entertainers. -they undergo vaccination at an early age. -they're vaccinated when they're young. -their parents understand basic science.
their parents base their medical decisions on advice from has-been adult entertainers