A solution comprises solute and solvent that can be in the form of the same or different composition. The water is solvent and the mixture is solute. Thus, option c is correct.
A mixture is a solution that may or may not have a definite and uniform composition. They even can have one or more phases. The mixture can be heterogeneous or homogeneous.
Here, the water is the solvent to which the solute, vinegar, and dye are added. The vinegar and dye both are liquid solutes that are added to the solvent to form a solution of definite composition.
Therefore, option c. mixture is the solute and water is the solvent.
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