What is the effect of adding more solute to an unsaturated solution?

When more solute is added to an unsaturated solution, it will continue to dissolve until the solution reaches its saturation point. This means the solution can still accommodate additional solute without any precipitation occurring. As the solute dissolves, the concentration of the solute in the solution increases. Eventually, once the saturation point is reached, any additional solute added will no longer dissolve, but until that point, the solution can incorporate more solute, thereby becoming saturated. Therefore, when more solute is added to an unsaturated solution, it leads to saturation, confirming the correct answer.

In context, other options do not accurately describe this interaction: the solute will dissolve until the saturation point is met, so it won't remain undissolved; the concentration will actually increase rather than decrease; and the solution won't dilute but rather become more concentrated until saturation occurs.