Final answer:
Water is identified as the solvent in a solution of water and sugar, due to its greater amount and because it retains its liquid phase.
Step-by-step explanation:
Within a solution, the solvent is commonly the substance present in the greater concentration and is responsible for dissolving the other substance(s), called the solute(s). When considering a mixture of water and sugar, water is the majority component and would be considered the solvent. Sugar, being present in a smaller amount, is the solute. In a typical solute and solvent relationship, the solute dissolves into the solvent, and the resulting mixture maintains the phase of the solvent—in this case, liquid. Therefore, in the scenario where we have 200 grams of water and 15 grams of sugar, water is the solvent due to its higher concentration and because it maintains its liquid phase.