Concept:Pressure affects the solubility of gases, but it has almost no effect on the solubility of solids in a liquid.
Explanation:For a solid dissolving in a solvent, solubility mainly depends on three factors: the nature of the solute, the nature of the solvent, and temperature.
The nature of the solute and solvent decide how well the solid can interact with the liquid molecules.
Temperature changes can increase or decrease the amount of solid that dissolves.
Pressure does not noticeably change the solubility of solids in liquids.
Pressure is important only for the solubility of gases in liquids.
Therefore, pressure is the exception among the given options.
Answer:C. pressure