A) "The diseases we immunize against are not gone and they are still deadly."
This quote best shows the harm that can come from a child not being vaccinated for deadly diseases. In this quote it shows that a child who contracts a disease that he or she could be vaccinated for may end up dead. Option B would support the idea of not vaccinating and the question needs evidence to support vaccinations. Option C is neutral either way. It is simply stating a fact without encouraging for or against vaccinations. Option D addresses parents concerns that vaccinations lead to autism. This does not imply that parents harm their children by NOT vaccinating them.
Answer: D is the answer.
Explanation: Cause and Effects Citations are when one is to look for a solution to a problem, most often, and D (last option) is the only option that does so and spells it out.