The statement that best describes the formation of a solution is:

A solution forms when one substance dissolves evenly into another substance, resulting in a homogeneous mixture.

Here's why:

* Dissolving: The process of forming a solution involves one substance (the solute) dissolving into another substance (the solvent). This means the solute's particles break apart and become surrounded by the solvent's particles.

* Evenly: The solute particles distribute themselves uniformly throughout the solvent, creating a homogeneous mixture. This means the solution has the same composition and properties throughout.

Let me know if you'd like more details on the process of solution formation!