The correct answer is:
(Choice C) A water solution is also known as an aqueous solution.
This statement is true, as "aqueous" refers to a solution where water is the solvent.
The other statements are not true:
- (Choice A) Ionic substances are generally soluble in water, not insoluble.
- (Choice B) Not all solutes dissolve easily in water; some are insoluble or have limited solubility.
- (Choice D) Water is a polar solvent, not a non-polar one.