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Regarding this particular question, I don't want to get into trying to read the minds of the original authors. However it is the case that some students think that if there were no air pressure, the object would float off the table. The idea seems to be that things in space are are weightless, so if there were no air, as in space, there would be weight.
So perhaps they were trying to see if students would pick C to
determine if they carried this misconception.