The solubility of a substance is 60 g per 100 mL of water at 15° C. A solution of this substance is prepared by dissolving 75 g in 100 mL of water at 75° C. The solution is then cooled slowly to 15° C without any solid separating. The solution is
a) supersaturated at 75° C.
b) supersaturated at 15° C.
c) unsaturated at 15° C.
d) saturated at 15° C.
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