What additional piece of evidence helps create Most complete argument that U. S. schools are working to avoid and mitigate a potential coronavirus outbreak?

The shutting down of schools across the U.S is essential because although most children do not appear to suffer much when they contract the virus they can still spread it.  Adults can be given instructions on how to prevent person-to-person transmission, and can be relied upon to follow those instructions to varying degrees, but it’s almost impossible to get children, especially younger ones, to do so.

Explanation:

answer; /// the amount of material dissolved in a measure of liquid(concentration) the above statement is (true); /// good luck