All other factors being equal, solute molecules diffuse most rapidly through option b: air.
What is the air in science?
The atmosphere of Earth or air is known to be a term that connote the make up of some layer of gases that is said to be held by Earth's gravity that tend to surrounds the planet.
Note that the Air is said to be the main name for the mixture of gases that tends to be composed by the Earth's atmosphere. This gas is nitrogen (78%) oxygen (21%), and others.
Therefore, All other factors being equal, solute molecules diffuse most rapidly through option b: air.
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