The option that give the characteristics of colloids in the question is that they are made up of at least two substances
- colloid can be regarded as a mixture involving two or more substance whereby one of the substance is been microscopically dispersed as an insoluble particles which are suspended throughout other substance.
- colloids can be translucent as a result of Tyndall effect, which is responsible for the scattering of light by particles in the colloid.
- Colloids are usually heterogeneous and not homogeneous because the particles are usually contains insoluble particles.
Therefore, the last option among the given options is correct.
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