Suppose That I Suspect That Running My Ceiling Fan Stirs

Multiple Choice

Suppose that I suspect that running my ceiling fan stirs up dust and causes my table to become dusty.How could I use the method of concomitant variations to confirm this?

A) Temporarily replace the table with a different table to see whether the new table also becomes dusty.
B) Remove the ceiling fan for a day to see whether the table still becomes dusty.
C) Observe whether running the fan for longer/shorter periods of time corresponds to greater/lesser amounts of dust on the table.
D) Vacuum the carpet and then observe whether the table still becomes dusty.
E) Test the air quality while the fan is running to see whether it has dust in it.