In a solution, what role do solutes play?

In a solution, solutes are defined as the substances that get dissolved within a solvent, forming a homogeneous mixture. When a solute is added to a solvent, it disperses throughout the solvent, resulting in a solution where the solute's particles are typically at a molecular or ionic level, thoroughly mixed with the solvent. This is why the term "dissolved substances" accurately describes the function of solutes—they change the properties of the solution, such as affecting its color, conductivity, and boiling point.

While the other aspects presented in the incorrect choices touch upon different characteristics or types of substances, they do not accurately capture the essence of what a solute is in the context of a solution. For example, solutes are not necessarily the substances that dissolve (as that describes the solvent), nor are they limited to gaseous states, and while they can affect the boiling point of solvents, this answer does not define their primary role as components of a solution.