Concept:Dissolved salt lowers the freezing point of water through freezing point depression.Explanation:When salt is dissolved in water, the solute particles disrupt the orderly arrangement needed for ice crystal formation.This disruption makes it harder for water to freeze at its normal temperature of 0∘C.As a result, the freezing point drops to a temperature below 0∘C.Hence, the effect of dissolved salt is that the freezing point of water is lowered.Answer:A. the freezing point is lowered