Which characteristic is true about a suspension?

A suspension is defined as a heterogenous mixture in which solid particles are dispersed throughout a liquid but are not dissolved. This means that solid particles are suspended in the liquid, and they will typically settle to the bottom over time if left undisturbed. The defining characteristic of a suspension is thus that it holds solid particles distributed in a liquid. This explains why the answer is C; an example of a suspension would be muddy water, where solid dirt particles are distributed throughout the water.

The other characteristics mentioned in the choices do not accurately describe a suspension. For instance, a suspension does not remain uniformly mixed indefinitely and will settle over time, which is contrary to the claim that it does not settle. Instant dissolution is characteristic of solutions, not suspensions, which require agitation to mix effectively. Finally, heating a suspension is not a requirement for mixing; it may aid in dissolving certain substances but is not a characteristic condition for suspensions in general.