Which of the following is an aqueous solution?

Non-aqueous solutions are created when a solute is dissolved in a solvent other than water. Aqueous solution is what is produced when a solute is dissolved in any liquid-state solvent.

An aqueous solution is one in which the solute is combined with water or another liquid as the solvent. For instance, the NaCl solution is an aqueous solution. Since a solution of sugar and water is an aqueous solution, the third option will be the right one.
Non aqueous Solution: A non-aqueous solution is one in which the solute is introduced to any type of solvent other than water or a liquid. As an illustration, copper and zinc may be dissolved to create brass solution.

Hence the correct option is C.