Answer: Option (b) is the correct answer.
Explanation:
A solution in which concentration of solute is lower than the equilibrium solubility is called an unsaturated solution.
Whereas a solution in which no more solute can be dissolved is known as a saturated solution.
Since solubility is proportional to temperature, therefore, decreasing the temperature will decrease the solubility. As a result, the solution will become saturated as on decreasing the temperature no more solute is soluble in the solution.
