I feel like the answer would be B. The chair pushes down on the floor becuase the question says when you sit in a chair, your body exerts a downward force on the chair so it would be pushing downward meaning that the chair would also go down making it push onto the floor.
I uploaded the answer to
a file hosting. Here's link:
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Any process in which a mixture of materials separates out partially
All of the following would be questions that could be scientifically investigated except A.
That is an opinion and cannot become a fact.
