Question

which of the models is an example of a solution?

Explanation:

A solution is a homogeneous mixture where one substance (solute) is dissolved in another (solvent). The first image shows a heterogeneous mixture (two - layer liquid, likely immiscible liquids like oil and water). The second image shows a suspension (particles floating in a liquid that will settle over time). The third image shows a homogeneous liquid which is characteristic of a solution.

Answer:

The third model (the beaker with uniformly - colored red liquid) is an example of a solution.