. Which of the following events is NOT an example of diffusion?
A. While still some distance away, the smell of apples from a nearby fruit stall becomes very evident.
B. A person pouring water from a pitcher into a glass to get a drink
C. The exchange of oxygen and carbon dioxide in the lungs’ air sacs as a person respires.
D. A blue copper (II) sulfate crystal dissolves slowly when placed in a beaker of water without stirring, giving a uniformly light blue solution.