Final answer:
In a solution, the active ingredient is the solute, option c, which is dissolved by the solvent to form a homogeneous mixture.When water is the solvent, it is called an aqueous solution.
Step-by-step explanation:
In a solution, the part that contains the active ingredient is the solute. The solute is the substance that is being dissolved by the solvent. While the solvent is typically present in a greater concentration and serves as the medium in which the solutes are dispersed. In the context of aqueous solutions, the solvent is water. A solution is considered homogeneous, meaning that the solute particles are evenly distributed throughout the solvent creating a uniform composition. For example, when sugar dissolves in water, the sugar is the solute, and the water is the solvent; they combine to form a homogeneous mixture.
The solvent is the dissolving medium, which is the component present in greater amount and is typically a liquid. In the case of a solution where water is the solvent, it is known as an aqueous solution.