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Asma lit a perfume stick in the corner of a room. When she stood at the other corner, she smelled the perfume after sometime. What can we conclude from this?

A)  Rooms produce perfume when a perfume stick is lit in a corner.

B)  All the air present in a room gives perfume.

C)  Perfumes do not spread from one place to another.

D)  All gases, including perfumes, have the property of spreading from one place to another.