A perfume bottle is dropped in the corner of a room and it shattered. The odor of the perfume can be detected on the other side of the room. Which statement best describes this observation?

The perfume molecules spread through the air from the area near the broken bottle, where their concentration is high, toward areas farther away, where their concentration is low. This spreading is diffusion, so choice A best describes the observation.

AI-written and checked against the verified answer.