Supersaturated solutions hold more of the solute at higher temperatures than they would at room temperature. Hence, the correct answer would be that the water would need to be heated to a higher temperature, which would give molecules and ions more kinetic energy, increasing solubility.
Generally, solubility increases with increase in temperature. At higher temperature, the kinetic energy of molecules in solution increase. Consequently, more of the molecules/ions of solutes collide more with each other and dissolve. At lower temperature, the molecules of the solutes crystalize out in solution.
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