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<span> I think the answer should be State-licensed day care center</span>
Answer:
a) Negative correlation
Explanation:
Negative correlation is a term which basically explains a relationship between to variables in which increase in one variable causes a decrease in the other variable and vice versa. As in the given scenario, the more frequently the teeths are brushed ( variable is increasing ) the less likely is the chance to develop cavities (variable is decreasing)
Hence a)negative correlation is the right answer.
Trustworthy would be a government website.
Untrustworthy would be a media report
Hope this helps!