An aqueous solution is made up of a. colloids b. pure water molecules c. ions dissociated in solution d. covalent molecules in a water solution.

I believe an aqueous solution is made up of ions dissociated in solution. An aqueous solution is a solution in which water acts as a solvent. For example a solution sodium chloride in water is shown as Na+(aq) + Cl-(aq). Most acids and bases exists in aqueous solution form.