What describes a suspension in a liquid medium?

In a suspension, finely divided particles are distributed throughout a liquid medium but are not fully dissolved. This means that the particles can settle at the bottom over time if the mixture is left undisturbed. To ensure the even distribution of these particles for effective use, the mixture usually needs to be shaken before application. This characteristic distinguishes suspensions from solutions, where the particles are completely dissolved and cannot be separated by settling.

The other options describe different states of matter or mixtures. A solution, for instance, is when particles are entirely dissolved, while a clear liquid with no visible particles does not reflect the presence of undissolved matter typical of a suspension. The description of particles that can sediment without requiring shaking refers more closely to suspensions that are stable over time but doesn't capture the essential requirement of shaking to achieve an even distribution before use. Therefore, the correct option highlights the need for agitation due to the presence of undissolved particles.