* Supersaturated solutions hold more solute than they normally could at a given temperature. They are unstable and can be easily triggered to crystallize, forming a precipitate. Agitation provides the necessary energy to start the process.

Here's why the other options are incorrect:

* Saturated solutions are at equilibrium, meaning they hold the maximum amount of solute they can at that temperature. They won't form a precipitate with agitation.

* Unsaturated solutions can dissolve more solute. They won't form a precipitate with agitation.

* Concentrated solutions simply have a high amount of solute. While they might have a higher chance of being supersaturated, the key factor is whether the solution holds more solute than its saturation point.

In summary: Supersaturated solutions are "holding their breath" when it comes to dissolving solute. Agitation provides the trigger for them to release that excess solute as a precipitate.