In the passage it says :
Elementary school nurses in Renston report that the proportion of schoolchildren sent to them for treatment of allergic reactions to those chemicals has increased significantly over the past ten years.
In Option C : Children who have allergic reactions to the chemicals are not more likely to be sent to a school nurse now than they were ten years ago.
As per option C , less number of children reporting to nurses now compared to the number of reporting 10 years back
...
Elementary school nurses in Renston report that the proportion of schoolchildren sent to them for treatment of allergic reactions to those chemicals has increased significantly over the past ten years.
In Option C : Children who have allergic reactions to the chemicals are not more likely to be sent to a school nurse now than they were ten years ago.
As per option C , less number of children reporting to nurses now compared to the number of reporting 10 years back
...
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