Answer:
The statistics show how many people aren't vaccinating their children.
Explanation:
Statistics aren't provided specifically to writers by doctors, they come from whatever reports the writer chooses to use, so that rules out choice 2.
I assume the passage is making a point about how vaccines should be trusted and the anti-vax movement is detrimental, so choice 3 would prove the opposite point.
Statistics are logical, not emotional, so choice 4 is out.
Therefore, choice 1 is the only logical answer.
(I can't be completely sure of this answer without seeing the actual paragraph- I could be wrongly assuming the point that the author is trying to make. If they are trying to prove that vaccines <em>are</em> widely used, then the answer is choice 3. However, that doesn't seem like a very argumentative point to me, so I assumed that they were trying to prove that vaccines need to be used <em>more</em>, making the answer choice 1.)
