The answer here is B they are each made of matter. some are compounds, and some are elements they all contain Atoms this is because Silver and Oxygen are elements while Carbon Dioxide and Water are compounds. Although you do not have the choices down, I have come across this question before.
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Wet floor signs when needed
Equipments are in correct places
Label everything
If anything happens on your shift, inform the next shift
Don't see any choices so thats what I could think of
